To get 100% here, theoretically, you need to beat the game at least twice. To be more exact, I would say three times is more likely. Instead of writing multiple guides for insane difficulty and / or score achievements, challenges, etc., I will write everything down in a single interval guides. It will contain everything from Alma doll locations, some Psychic Links that are not always on your way for pick up, as well as challenges that are possible to achieve in given interval.
However, if you do not achieve the score achievements in your first go, maybe it is better to wait until you reach Rank 21, as you will get more health, more slow-mo, possession time, faster health regeneration, deeper ammo pool, which will make all the score runs easier.
Also please take note that you need to complete the game at least once in order to unlock Insane difficulty. The game is not that hard at all, except some parts that will probably give you some hard time on insane. I recommend playing your first playthrough on Commando difficulty, as you can use the same for completing score runs / achievements.
I recommend playing as Point Man for score achievements. In fact, everything is easier as Point Man, simply because slow-mo. Fettel have some specific achievements / challenges which you can easily do while doing multiplayer / coop achievements / challenges. That being said, I don't recommend playing as Fettel through solo campaign at all.
For each interval / score achievement you will need to maximize your points gain and this is better to do solo, because all challenges and scores are individual for each player. To maximize your point gain, you need to chain your kills with multiple challenges for maximum efficiency. For example, get headshot kills from cover while in slow-mo, and that on multiple targets if possible. Don't worry, it is not that hard as it sounds, once you get used to it, it is quite easy. Practice cover and headshot early in the game, even if you don't go for high score. Also for score runs, each map have target time for optimal level completition. This sounds like it is useful for score runs, but in fact it is not. For each minute you have under the target time you get ~1000 points. The thing is that this game is quite linear and it haves a lot of scripted events which you can't skip, until you meet the requirements, e.g. kill all enemies in that area for this doors to open. That being said, it is not worth it to rush through it while going for high score.
Not being killed, or not restarting checkpoint will give you Clear Run bonus worth 5000 points. There is one thing attached to this, but I will come to that later.
For Recruit difficulty you get no points. For Commando (recommended) you get 5000, Fearless, 10000, Insane, 15000.
You don't need to play on insane to maximize your point gain, the important part to this is to do as many challenges as possible in single run.
So, without further ado, lets see what we get with the first part of this guide:

• Completionist
  - Complete every challenge at least once.

If you follow this guide, you should get most of the challenges needed for this. If you miss some, you can simply replay the interval where you have the most chances to complete needed challenge. You can check your challenges through Scoring > Rank/Challenge and then highlighting the Challenge tab from the main menu.

• Supreme Challenger
  - Complete 500 total challenges between all categories.

This is accumulative across all your playthroughs. Each Alma doll and psychic link counts as separate challenge.

• Spiritually Attuned
  - Make 100 Psychic Links (share or steal).

You will most likely get this on your first playthrough.

• Score Monger
  - Complete 30 challenges in one Interval.

This is not as hard as it sounds. You will most likely get this one while doing score runs in any interval.

• Doll Collector
  - Find the Alma Doll on every mission.

• Man Mode
  - Finish the Campaign on INSANE difficulty.

• Almost Halfway
  - Attain Rank 10.

• You've got the Touch!
  - Attain Rank 21.

• Mission… accomplished?
  - Finish the campaign on any difficulty (all Intervals complete).

• Extremist
  - Complete any campaign level on INSANE without reloading checkpoints or going into Last Stand.

Probably easiest to do on INTERVAL 03 - Store, as there are a lot of melee enemies with few ranged. With Pointman and slow-mo, it should not be the problem.

• A Precursor
  - In the poker room of Prison, kill all 3 enemies with headshots before slow-mo ends.

Check INTERVAL 01 - Prison.

• State-of-the-art. Bang, bang!
  - Kill 10 enemies in a row with Sniper Rifle headshots.

• That's a lot of Zeros
  - Attain a total of 250,000 points through challenges.

Another accumulative. Similar to Supreme Challenger.

• Footy Foul
  - Kill 2 enemies with 1 Slide Kick during Slow-Mo.

You can do this on any interval. Really not hard at all.

• God Among Men
  - Kill 250 total enemies during Slow-Mo.

You will most likely get this on your first playthrough.

• Yo, Adrian!
  - Find something worth punching!.

Secret achievement! Check either INTERVAL 03 - Store or INTERVAL 08 - Ward.

There are some other achievements which can be done in either mode, including campaign, coop, multiplayer. For more info see Solo miscellaneous Achievements and Multiplayer / Co-op miscellaneous Achievements.

I will list all possible challenges for each interval, including their possible difficulty, with a short info on how to do it. Note that these are meant to aid you while doing score achievements, but you can do them for the sake of practice, or while working toward the Completionist achievement. If the challenge repeats for next interval, please refer to this part if you need a reminder. The one I tag as EASY, should be done on EVERY interval (where available) if going for the high score. MODERATE / OPTIONAL are there if you've done all EASY (therefore MODERATE) and / or for Completionist achievement. Depending on interval, some of them can be EASY as well. There is only one challenge which I consider HARD and that is Godlike for 20 kills without taking any damage. I will also list COOP and FETTEL ONLY as separate categories. Also, there are few level specific challenges, namely for INTERVAL 08 - Ward. I will list these as GHOST. Also please take note, that I've listed all the challenges that could be done for given interval. I don't think that you can do all gun challenges listed, you will need to decide that for yourself. ALWAYS do cover, slow-mo, headshot challenges in each interval. Also try to go for kill challenges in each interval as well.

• EASY
  
  • 4500 - Pop Gun - Kill 20 enemies with the Pistol (Strader Mk. VIII). This is the first gun you pick up in the game. It can be (and it should be, unless stated otherwise) done on almost all intervals.
    
  • 3000 - The Standard - Kill 25 enemies with the SMG (Briggs SMG). Same as above.
    
  • 4500 - Butcher - Kill 20 enemies with the Shotgun (EL-10 CAS). I recommend doing this last, simply because it is hard to get headshots with this from cover.
    
  • 3000 - Assault Pro - Kill 25 enemies with the Assault Rifle (G3A3 AR).
    
  • 3500 - Bullet Hose - Kill 20 enemies with the Uzis (Dual MP-970).
    
  • 4000 - Ghost - Kill 15 enemies with the Sniper Rifle (Schuller LDR50). This is quite easy on each interval where this gun is available. Can be done together with State-of-the-art. Bang, bang! achievement.
    
  • 5000 - Ventilation Expert - Kill 25 enemies with the Penetrator (S-HV). Very potent gun. The only place to get 25 kills for this challenge is INTERVAL 07 - Port.
    
  • 4000 - Like A Hurricane - Kill 3 enemies with the Rocket Launcher (Goliath).
    
  • 5000 - Laser Pointer - Kill 10 enemies with the Laser Rifle (Arc Beam).
    
  • 3500 - Quiet Riot - Kill 10 enemies with the Riot Gear (Shield).
    
  • 2500 - Headhunter - For 25 headshots. I've already mentioned this, try to pop heads, while in active cover and with slow-mo on.
    
  • 5000 - Executioner - For 50 headshots. Quite easy depending on what interval you are. Not as hard as it sounds.
    
  • 3000 - Cover Op - Kill 10 enemies while in cover.
    
  • 6000 - Cover-Up Artist - Kill 25 enemies while in cover.
    
  • 1000 - Pitching A Tent - Use cover for 100 seconds.
    
  • 2000 - Sir Camp-A-Lot - Use cover for 200 seconds.
    
  • 500 - Gatherer - Collect 15 ammunition or grenade pickups.
    
  • 1000 - Junk Collector - Collect 30 ammunition or grenade pickups.
    
  • 3000 - Perfect Soldier - Kill 3 enemies with headshots in one slow-mo. You will get this together with A Precusor achievement.
    
  • 5000 - Supersonic! - Kill 30 enemies while in slow-mo. I've already said that you should play as Point Man if you go for high score. This is quite easy to do, and it is Point Man ONLY!
    
  • 10000 - Hypersonic!!! - Kill 50 enemies while in slow-mo.
    
  • 2500 - All In The Reflexes! - Spend 60 seconds in slow-mo.
    
  • 3000 - Nothin' Or Double - Spend 120 seconds in slow-mo.
    
  • 1500 - Psychic Link Attained - Grab A Psychic Link. Note that this is 1500 points for each psychic link you grab. Almost all levels have 10+ psychic links.
    
  • 5000 - Mommy! - Collect an Alma Doll. Refer to each INTERVAL for possible Alma doll locations.

• MODERATE / OPTIONAL
  
  • 5000 - The Killer - Kill 50 enemies in a row. Doesn't necessarily need to be hard. It is here just because it is kind of tied together with Clear Run bonus. This challenge will reset any time you die, go into last stand, reload checkpoint, restart the current mission, or resume gameplay from a checkpoint. Can be done on most levels, except last one.
    
  • 10000 - Hard Boiled - Kill 100 enemies in a row. Can be done in INTERVALS 03 - 07. Other than that check the info above.
    
  • 3500 - Sweet Science - Kill 15 enemies with any melee attack. Not hard, just situational.
    
  • 3000 - Et tu, Brute? - Kill 3 enemies with a backstab attack. If needed, can easily be done with slow-mo combo.
    
  • 3500 - Hot Potato - Kill 10 enemies with Frag Grenades. It is unlikely that you will get this together with other challenges. Maybe the best way to get this is to play as Fettel, because when you possess the enemy, he will most likely have grenades on him already.
    
  • 1500 - The Shocker - Kill 3 enemies with Zap Grenades. When you have the chance, do it!
    
  • 2500 - Indecent Exposure - Blind 5 enemies with Flash Grenades. Try to blind more than one enemy with this one, as Flashbang ammo is not all that common.
    
  • 5500 - Slaughter - Kill 20 enemies in a mech without getting out. Can be done with both PA and EPA.
    
  • 2500 - What!? - Kill 5 enemies with a stomp attack while in a mech. Use space for special "stomp" attack while in any Power Armor. Melee kills count toward Slaughter as well.
    
  • 1500 - Menage! - Kill 3 enemies with one explosion. It sounds easy, but in practice it is not. You might get lucky and pull this off if enemies are clustered together. However, there is a sweet spot for easy completition of this as well as some other challenges in INTERVAL 04 - Suburbs.
    
  • 3000 - Detonation Expert - Kill 5 enemies by shooting explosives. Same as above. Each level have some explosive objects which you can use to count towards this challenge. Probably easiest way to do this is during INTERVAL 03 - Store by killing suicide cultists.
    
  • 1500 - Nimble Killer - Kill 5 enemies immediately after using Mantle. In case you missed this one in game, you do mantle when you are inside the cover, and you look out the cover and press space to vault over it. Killing someone immediately after landing counts for this challenge. Use slow-mo for easier kills as well as for multiple kills.
    
  • 3000 - Parkour Deadly - Kill 10 enemies immediately after using Mantle. Same as above.
    
  • 2500 - Slideshot! - Kill 10 enemies immediately after using Slide Kick. Pretty much the same as mantle kills. Instead of vaulting over the cover, simply do slide kick without killing the target, then shoot it to death. You can do this even without touching the target before shoting it, and it will still count.
    
  • 5000 - Invincible - Kill 10 enemies in a row without taking damage. Not that hard to do if you take cover and use slow-mo to kill your targets.
    
  • 10000 - Godlike - Kill 20 enemies in a row without taking damage. Same as above, but this one might be a little harder to pull off, depending on how good you are and / or most important how patient you are :). Theoreticaly it can be done on any level, but I will give you one sweet spot where it is possibly easier to get in INTERVAL 07 - Port.
    
  • 1500 - Collection Agent - Collect 60 ammunition or grenade pickups. Not something you should go for on any interval. Will most likely be done spontaneous. If you need it for Completionist, you can simply stand on a weapon refill, fire one bullet, reload and repeat until complete.
    
  • 4500 - Slow Your Role - Kill 5 enemies in one slow-mo. This one is quite easy or frustratingly hard, depending mostly on luck whether the enemies are clustered together and are easy targets. However, there is one sweet spot to get this one quite easy on INTERVAL 04 - Suburbs.
    
  • 3000 - Highlight Reel - Kill three enemies with unique melee attacks in one slow-mo. Pretty much the same as above. You need to kill 3 enemies, each with different melee attack, e.g. backstab, slide kick, jump kick, normal melee slash. Can easily be done on INTERVAL 04 - Suburbs.
    
  • 1500 - Big Spender - Drain the Slow Motion meter from full three times. Not hard at all. It is just situational.

As already said, these should be done separate, but are needed for Completionist achievement.

• COOP
  
  • 1500 - Death From Below - Kill 3 enemies in one Last Stand. There is no last stand when playing solo, so yeah, you need to play coop for this. Also, do this as Pointman with a pistol somewhere, where there are lot of enemies, like INTERVAL 05 - Tower, the part with a lot of cultists.
    
  • 3000 - Pick-Up Artist - Perform 3 quick revives on your brother. For this one, you need to revive your coop partner before 25% of the gauge is depleted.
    
  • 3000 - Helping Hand - Perform 15 assists. Just shot enemy once and let your partner kill it.
    
  • 6000 - Harm Aid - Perform 30 assists. Same as above.
    
  • 5000 - Damage Resistant - Fettel Shield absorbs 300 damage for Point Man. If you use your right click suspension on Pointman, it will give him shield which lasts for about 3 seconds. Any damage done to Pointman while the shield is up, counts for this challenge.
    
  • 5000 - Hangman - Pointman kills 15 suspended enemies. The next three challenges are for Fettel, but in coop. For this one just suspend enemies for Pointman to kill them.
    
  • 5000 - The Crusher - Fettel kills 5 enemies with the Co-Op attack. Fettel can perform this attack only during Pointmans slow-mo. It is a very strong shockwave AOE attack. Simply kill 5 enemies with it. You can do it while doing the next challenge in line.
    
  • 5000 - This Isn't So Hard - Fettel kills 15 enemies during slow-mo.
    
  • 1000 - Share A Psychic Link - Share A Psychic Link. When grabing Psychic Link in coop, you get the option either to share or to steal the link. Share it to complete this challenge.

• FETTEL ONLY
  
  • 10000 - Little Brother - Kill 20 enemies with the Fettel Blast. Quite easy. Just kill 20 enemies with his left click blast attack.
    
  • 5000 - Borrowed Time - Kill 30 enemies while possessing. Accumulative through the whole interval. Possess the body and kill enemies.
    
  • 10000 - Rent-To-OWN! - Kill 50 enemies while possessing.
    
  • 3000 - Showing Off - Kill 5 enemies with headshots in one possession.
    
  • 4500 - Time Efficient - Kill 15 enemies in one possession.
    
  • 1500 - Enemy Within - Kill 5 enemies by suiciding the body.
    
  • 2500 - Body Snatcher - Spend 120 seconds possessing enemies. Accumulative through the whole interval.
    
  • 3500 - Head Intruder - Spend 240 seconds possessing enemies.
    
  • 3000 - Extended Stay - Spend 120 seconds possessing the same body. Find some place like already mentioned INTERVAL 05 - Tower, the cultist part. Possess one of the two soldiers there and start killing cultists. You can get this and Time Efficient in one go.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier - You will get this together with A Precusor achievement, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Butcher

• MODERATE / OPTIONAL
  
  • The Killer , Executioner, Invincible, Collection Agent, Big Spender

____________________________

When you hear soldiers speaking about poker game behind some doors, be prepared to do one of them easiest achievement in this game,

In the poker room of Prison, kill all 3 enemies with headshots before slow-mo ends.


As soon as you open / break the doors, you will auto enter slow-mo with enough time to headshot all three guys. Simple as that. This occurs when playing Fettel as well.

____________________________

There isn't much to this level. Other than the achievement above, there is only one Alma doll location, listed below. You need to break the lock on wired doors left and go all the way down the stairs.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Ghost, Like A Hurricane

• MODERATE / OPTIONAL
  
  • The Killer , Executioner, Invincible, Collection Agent, Big Spender, Butcher, The Shocker

____________________________

Once you get out of sewer, you will eventually come to this point. One of the possible Alma doll locations is where I am pointing my gun at.

____________________________

Once in the area with some statue and wreckage all around it, in the building to follow you can find your first sniper rifle. From this point you can start working on your State-of-the-art. Bang, bang! achievement. Be sure to use slow-mo to get headshots. If you miss, don't worry, important is not to break the chain with body shot. However, if you do fail and kill him with body shot, I would not recommend restarting the checkpoint as that can void all your challenges you've done since the last checkpoint. You will get a few more opportunities to get it later.

After the fight in some courtyard, you need to go up stairs to some sort of control room, after that you need to kill some more APC soldiers and then locked doors in that very same room will unlock leading you to next area. From those doors, when you get down the stairs, check the room on your right / front for another Alma doll location.

____________________________

This is the room just before the fight with your first mech. From the picture below, the doll is where I am pointing my gun at.



In the same are where you fight mech, the doll is where I am pointing my gun at. You need to jump over there from that ledge on right.

____________________________

When you reach Phase Caster, do not kill him right away. Instead you can "farm" this guy. When he phase in the soldiers, simply kill them and wait for another phase. After some point he will stop spawning them, kill him and complete the interval. You can do this on any interval where there is a phase caster, to complete as many challenges as possible.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Bullet Hose, Butcher, Indecent Exposure

• MODERATE / OPTIONAL
  
  • The Killer , Hard Boiled, Executioner, Invincible, Godlike, Collection Agent, Big Spender

____________________________

As soon as you start this interval, turn around and enter that store exit area for psychic link.
At the end of that first store area, you should go through the blue doors to continue further, instead turn left and use the switch to open the doors and collect another psychic link.
____________________________

You can find your first Alma doll location in next store area once you get all the way up those shelves. You need to sprint jump on the ladders left to get it.

____________________________

The next doll location is where you meet first suicide cultists. It is right behind that curtain.

____________________________

When you get inside that meat locker, repeatedly melee one of the cow carcasses until this achievement pops.

Find something worth punching!


After this area, you will be able to find cover spots. Use them to get cover challenges from now on.
____________________________

In the next store area, on your way up the next shelves, refer to picture below for next Alma doll location. The doll should be where I am pointing my gun at.



After you drop down from the shelves, refer to two next pictures for another Alma doll location. Once you reach the stairs from first picture, turn around and get below the shelves for the doll.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Assault Pro, Ghost, Indecent Exposure, Hot Potato, Slaughter, What!?, Slow Your Role, Menage!, Detonation Expert

• MODERATE / OPTIONAL
  
  • The Killer , Executioner, Invincible, Collection Agent, Big Spender, Butcher

____________________________

When you drop down on that destroyed power armor, there is a psychic link on your left. Once you drop down from that floor, there is one psychic link in front and another on your right next to the fence.
____________________________

The first Alma doll location is in that little house where I am pointing my gun at.

____________________________

After the mech fight you need to go inside another house. In that house after the creep part and after you go through the kitchen, you will see a big TV and a couch in front of it. You can find a psychic link lying in between.
After this, go up the stairs, first door on your right. Inside that room there are three doors on your left. Go mid ones for another Alma doll location.

____________________________

After some time, you will see a couple more Alma events. You will come to a room with some lights on the walls and a way lighten up with candles leading you to another house, where you need to drop down to bottom floor. That next house and that very room contains some cultist bunched around TV. You can use this very spot to complete some challenges that are otherwise not that easy to do. Challenges that you can do here quite easy are: Slow Your Role - For five kills in a single slow-mo. Menage! - For three kills with a single frag grenade. Highlight Reel - Kill three enemies with unique melee attacks in one slow-mo. You can combine any of the last two with Slow Your Role in one go.
____________________________

After the cut scene and once you spawn at that playground there is a psychic link slightly on your right, lying in the corner next to the wall. Another one is from your starting position, turn around and you should see some reflector lights. Psychic link is behind that reflector and power generator holding it.
Once in that house, you can find sniper rifle on the top floor. If you already havent done State-of-the-art. Bang, bang! achievement, this is another suitable place to do it.
Another Alma doll location is next to your first power armor.



Once you get inside PA, be sure to melee the soldiers with space for What!? challenge. These five kills count towards Slaughter challenge. In fact I recommend killing all them soldiers with melee, to get Sweet Science challenge as well.
____________________________

Next Alma doll location is in the next building after you leave your PA. It is right where I am pointing my gun at.



The next Alma doll location is right after in the next room, behind some crates.



When you exit this room, you will fight another Phase Caster. Be sure to farm for remaining challenges here before completing the interval.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Butcher, Assault Pro, Ghost, Laser Pointer, Quiet Riot, Indecent Exposure

• MODERATE / OPTIONAL
  
  • The Killer , Hard Boiled, Executioner, Invincible, Godlike, Collection Agent, Big Spender

____________________________

Early on your way through the interval, you will come to some hallway with a lot of bloody Alma graffiti. Go right and you should see a door which you can open up just a little, but enough to shoot the lock off of the door in that previous hallway. There is Alma doll location left, in the corner.

____________________________

Once out, look out for the Alma doll location, next to first sinkhole. It should be where I am pointing my gun at, in second picture.

____________________________

Where you drop down from the roof, one of the Alma doll locations is under that wooden balcony from where you jumped off.

____________________________

Just before the part with multiple sinkholes, look for another Alma doll location, behind that fence. The doll should be where I am pointing my gun at.



In the same area, after the first set of sinkholes, right after you drop down from that roof like structure. The Alma doll should be where I am pointing my gun at.



Once you reach your first Phase Commander and after you kill him, do not pick up The Penetrator as you do not have enough enemies to complete the challenge. Instead focus on your ongoing challenges.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Butcher, Assault Pro, Like A Hurricane, Slaughter, What!?

• MODERATE / OPTIONAL
  
  • The Killer , Hard Boiled, Executioner, Collection Agent, Big Spender

____________________________

The first Alma doll location is right at the interval beginning, behind that train wagon on your right from where you spawn.


____________________________

After the heli crash, there is a bloody, wrecked train wagon just in front of you. As soon as you enter it, you can go left from there inside another train wagon. From entrance and where I am pointing my gun at, is one of the Alma doll locations.


____________________________

When you reach second stairway to the bridge, go left and trhough train wagon for another Alma doll location. The doll should be where I am pointing my gun at in that second picture.

____________________________

In the area where you fight second phase caster, one of the Alma doll locations are in the far left corner of that area, behind the light reflector.


____________________________

In the area after the first bridge, where the second EPA is, from bridge on left side, is another Alma doll location. This one is somewhat unlucky, because to get it, you need to break you Slaughter chain, and get out of EPA as you can't pick it while in EPA. It is up to you, whether you want the doll for achievement or slightly more points from Slaughter challenge.


____________________________

However, to maximize you points gain, once you get Slaughter, you should get out of your EPA and complete your ongoing challenges. If not already, try to get rocket launcher for Like a Hurricane challenge.

Challenges to be done on this interval:

• EASY
  
  • Headhunter, Cover Op, Cover-Up Artist, Pitching A Tent, Sir Camp-A-Lot, Gatherer, Junk Collector, Perfect Soldier, Supersonic!, Hypersonic!!!, All In The Reflexes!, Nothin' Or Double, Psychic Link Attained, Mommy!, Pop Gun, The Standard, Bullet Hose, Butcher, Assault Pro, Ghost, Ventilation Expert, Laser Pointer, Quiet Riot, What!?, Indecent Exposure

• MODERATE / OPTIONAL
  
  • The Killer , Hard Boiled, Executioner, Invincible, Godlike, Collection Agent, Big Spender

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You can get a fairly easy Invincible challenge worth 5000 on the way inside. Grab that SMG at the very beginning and kill every monstrosity without them hurting you. On your way be sure to grab assault rifle as well. I recommend having full slow-mo once you get inside. One will pop up out of wall in front of you and two other will come from that hall on your right. Be cautious.


____________________________

Once you are out of airport terminals, into hallway with some wooden boxes, there is one box on your left from the entrance. Jump over the box, to find a psychic link.
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Once in front "Zelig's Downtown", go through the door there for your first Alma doll location on this interval. The doll should be where I am pointing my gun at in the second picture.

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From there, down the stairs and before entering and going through that bloody elevator, turn around you for another Alma doll location.



Once up the stairs, go right and there is another shop "Sophie's". Go under the gitter for another Alma doll location.



From the same stairs, on your right you should see a door as well. Inside there is another Alma doll location as well as psychic link.


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Where you see young Alma on that escalator, on your right there is another shop. Go inside for another psychic link.
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After the helicopter part and once in that yellow stairway, be sure to go all the way down for another psychic link.
____________________________

After the helicopter crash, and where you start to see creep again, there is an escalator which you need to take up, instead go underneath them for another psychic link.
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Once you are done with two phase commanders, the next part to come is where you need to wait for bay doors to open while you've been attacked by alma's monstrosities. Remember the room where you've dropped down to? Use this room for easish? Godlike challenge. Once you press that switch, run back all the way back to already mentioned room. Use slow-mo where needed. Once inside the room, jump on the two boxes inside the room. It looks like the monstrosities bugg out sometimes and will not follow you inside if on the boxes. However it can happen that they do get inside, use slow-mo to buy you some time to kill them. It is not quite easy to get it, but at least you do not need to restart complete interval for another try. Here is a screenshot, just to prove it possible.


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When you are outside and after two phase commanders, be sure to jump inside power armor immediately. Melee all enemies there, including one of the phase commanders for easy What!? challenge.

Challenges to be done on this interval:

• EASY
  
  • Cover Op, Pitching A Tent, Sir Camp-A-Lot, Gatherer

Note that the challenges listed below are specific to this interval only. Basically, there are some challenges that require you to kill the giant creep fast, while for most of them, you need to drag out the fight. However you will need to do multiple runs of this interval to get them all for Completionist achievement.

• GHOST
  
  • 2500 - Ghost Cowboy - Kill 5 Ghost Soldiers with the Handgun. This should be quite easy, just be sure to take it up with you through the whole level.
    
  • 2500 - Ghost Offender - Kill 5 Ghost Soldiers with the Assault Rifle. Almost all the soldiers that creep spawns use assault rifles. That being said, this is probably the easiest challenge for this interval.
    
  • 2500 - Ghost Hoser - Kill 5 Ghost Soldiers with the Uzis. This can be done only when playing as Point Man. On your way to second memory, you should see locked gate on your right. Get inside to pick up the uzis.
    
  • 2500 - Ghost Eraser - Kill 5 Ghost Soldiers with the Shotgun. For this one you need to drag out the fight. It looks like shotgun soldiers spawn randomly for each wave. Luckily, for each challenge you are required to kill only 5 enemies. As soon as you get shotgun soldier, be sure to kill him first so you can grab his shotgun.
    
  • 2500 - I Know Kung-Fu! - Kill 3 Ghost Soldiers with melee attacks.
    
  • 2500 - Exorcist - Kill 6 Ghost Soldiers during Slow Motion. Only to be done as Point Man. It doesn't need to be in single slow-mo.
    
  • 2500 - Lucid Dreaming - Kill 3 Ghost Soldiers during 1 Slow-Mo. Only to be done as Point Man. This one needs to be in a single slow-mo activation. Not hard at all.
    
  • 2500 - Buster of Ghosts - Kill 5 Ghost Soldiers with the Fettel Blast. Only to be done as Fettel obviously.
    
  • 2500 - Possessive - Kill 6 Ghost Soldiers while possessing an enemy. Only to be done as Fettel. It doesn't need to be in single possession.
    
  • 2500 - Ghostly Cover-Up - Kill 5 Ghost Soldiers while in cover. No need to mention that this should be done together while doing the weapon challenges.
    
  • 2500 - Head Dead Prevention - Kill 5 Ghost Soldiers with headshots. Same as above.
    
  • 2500 - Hurt Him - Damage the Giant Creep. Every time you shoot the creep in that glowing spot, you will get this challenge. This is one of the challenges where it is better not to prolong the fight.
    
  • 2500 - Nightmare Warrior - Hurt the Giant Creep 3 times before it hides. This challenge can be done only if you do not prolong the fight and hurt the creep three times before he vanishes and spawn the soldiers. Obviously quite easy with Point Man. Each time he shows his glowing spot, use slow-mo for easier aiming and shot it.
    
  • 2500 - Nightmare Ninja - Damage the Creep 3 times without getting hit. You can get this together with the challenge above. Just be sure not to get hit and dodge his attacks. This can be done on small creep as well during the ward building part. As Point Man every time the screen flashes, look out for a black smoke as that is the creep as he approaches. When near, use slow-mo to dodge his attack while shooting him.

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On your way to the first memory, the door you need to go is on your left. Go a bit further for one of the Alma doll locations. The doll is behind those wired doors.

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In the first memory room, you will see some punching bags on your left. If you haven't already got Yo, Adrian! achievement in INTERVAL 03 - Store, this is another place to get it. Simply melee the bag a couple of times until the achievement pops.
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The second Alma doll location is in the office inside the second memory area. It is on your right as soon as you enter said office.


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On your way to third memory you should see some car tires stacked together. Behind them in the corner is the last Alma doll location for this interval.

• Insider Trading
  - Possess every type of possessable enemy.

You can do this as Fettel in campaign or in solo practice of Soul King as Wraith. Depending on Soul King map or round count, you can find most of the enemies there. This is the list of the enemies you need to possess in order to get this achievement:

• ATC Soldiers - Generic enemy you mostly kill, comes with various weapons. You must possess one of each weapon type (SMG, shotgun, assault rifle). Found in various intervals and Soul King.
  
• ATC Sniper - Covered in an urban ghillie suit, wields the sniper rifle. These are only found in INTERVAL 04, 05 and Soul King.
  
• Phase Caster - Regular sized ATC with a blue phase shield, summons ATC enemies. To be able to possess the Phase Caster, you must destroy his shield. Play the campaign in INTERVAL 02, 05 and 06.
  
• Phase Commando - Large sized ATC with blue phase shield, teleports through walls. To be able to possess the Phase Commando, you must destroy his shield. Play the campaign in INTERVAL 05 and 07.
  
• Melee Cultists - Civilian enemy, attacks with crude weapons or hands. You must possess one of each weapon type (hands, axe, pipe, wrench, crowbar). Found in INTERVAL 03, 05 and Soul King.
  
• Suicide Cultist - Civilian enemy, wears an explosive vest. Must play the campaign, found in INTERVAL 03 and 05.
  
• Cannibal - Civilian enemy, attacks with throwing knives. Must play the campaign, found in INTERVAL 03.

• Indecisive
  - Possess 20 different enemies in one round of Soul King.

This achievement can be done in solo practice of Soul King. Set the difficulty to Recruit and just run around possessing different enemies. Note that you CAN possess another enemy while still in a body.

• Unstoppable!
  - Win all 5 rounds of a 5-round Soul King match.

Can be done in solo practice of Soul King. Set the difficulty to Recruit, 5 rounds, 3 minutes per round and be the top ranked player at the end of each round for all 5 rounds to earn this achievement.

• Monarch
  - Win 20 rounds of Soul King.

Can be done in solo practice of Soul King. Use the same method as above. You need to complete 4 matches with 5 rounds each match, and be the top ranked player at the end of each round for all 20 rounds to earn this achievement.

• Hanging 20
  - Complete wave 20 in Contractions.

You can beat this solo quite easy on Recruit while playing on Mechanized Invasion map, and using PA all the time. Your PA will highlight every enemy on your screen, so even in deep fog you will be able to locate them. Shoulder laser do a lot of damage, so be sure to use it. There are some harder waves, but as long as you stick to your PA you should be fine. Your worst enemy here is Alma, as she can teleport you out of your PA, making you vulnerable to enemy fire. If you see red dot inside deep fog, it is Alma and you should go other way at that point. Also try to focus red highlighted enemies as they are the one that can do some serious damage to your PA. You can do this together with Handle With Care and Dead Blind achievements in one go.

• Handle With Care
  - Return 30 crates in one game of Contractions.

This game requires ONE player to bring 30 crates in one game. You can do this solo as well, together with the achievement above. The game of Contractions consists of 20 waves. The trick is to grab the boxes between the waves as the fog is cleared then and there are no enemies. Most of the crates spawn fairly near the base. Try and grab at least one crate each round, most likely you will be able to snatch two. Also, as you will use PA anyway, during the wave, try to grab all the crates (3 max per round), by leaving the last enemy on the map, while you try and grab remaining crates.

• Dead Blind
  - Spend an entire round of Contractions in deep fog without going into Last Stand.

Like already stated, do this together with the achievements above. Around wave 7 on Mechanized Invasion map, deep fog covers the ground. Just be in your PA, kill enemies and complete the wave. Do not grab any crates once the wave starts if you are doing this as single achievement as that could possibly void it. However if you are doing it together with the two mentioned above, once you grab 30 crates and get Handle With Care, just do the rest of the match inside your PA without going to base.

• We'll Try Again Tomorrow!
  - Survive 3 waves in Contractions in a row without anyone bringing back a crate.

You can complete this together with the other Contractions achievements or seperate in another match. If you are doing it together, focus on getting Handle With Care first. If you grab two crates each round you should complete it by ~Wave 15. Once you get it, you can complete the match grabbing this achievement as well.

• I F.E.A.R. Nothing!
  - Finish a wave of Contractions on INSANE without anyone going into Last Stand.

You can do this easy on Mechanized Invasion. Get PA and wreck everything.

• No can defense!
  - Kill 100 enemies with Jump Kick or Slide Kick.

Can be done on any mode.

• Earl of Pain
  - Kill 1000 enemies by any method in any game mode.

• Art Collector
  - Pin 100 total enemies with The Penetrator or Leaper knives.

You can do this as Pointman or Fettel. You just need to kill the enemies, you don't need to actually pin it on the wall.

• Head Crab Removal
  - 20 kills with a crowbar.

You can do this as Fettel through campaign, or in Soul King game.

Note that you can do any of above mentioned achievements in coop. Contractions achievements would probably be a lot easier in coop.

• Soul Gatherer
  - Attain a total of 6,000 Souls in one round of Soul King.

This achievements is impossible to do solo. In multiplayer even with only 2 player, you get x10 the points. To achieve 6000 souls in one round is quite easy on any map.

• Soul Hoarder
  - Attain a total of 25,000 Souls across all rounds of a Soul King match.

Same as above. Be sure to select 5 rounds, and 5 minutes per round would not be bad either, just to be sure.

• I'm not a Doctor, I'm a Medic!
  - Perform 50 revives in any game mode.

There is a sweet spot to do this fast in INTERVAL 05 - Tower. You and your coop partner should come to the part, where there are two turrets outside some building, including a few soldiers. There is some cover at where you come in. Kill the soldiers and then one of you should get downed by the turret fire. The one who is going for achievement should stay inside the cover and revive the other. Rinse and repeat. To make this faster, I recommend you both to get killed before doing this, and to switch difficulty to insane. Once both done, you can switch back to any difficulty you've previously been on.

• Little Brother's Helper
  - As Point Man, kill 100 enemies suspended by Fettel.

• Big Brother's Helper
  - As Fettel, suspend 100 enemies that Point Man kills.

• Published the first version of the guide.

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