This guide is mainly focused on the most efficient way to farm the bosses in the time machine for their super-rare junk, because the drop-chances for these can feel STUPID low, and even with this guide, you will probably end up spending several days for this one (as opposed to weeks :) ).



I suggest you attempt obtaining this achievement on a New Game+ either on the Berry Sweet or Bitter difficulties to take advantage of the following:

• being able to eat up to 5 of the same sushi per fight.
  
• the roulette buffs/revival when you die.
  
• having a fully beefed up Travis.
  
• having enough junk to craft some very important chips to help the grind.

Also, you only need to craft 1 of every chip for the achievement to unlock!

Massive props to HV-Gaming, as he provided a comprehensive video playlist of the most optimal way to farm the hardest chips to make farming everything else as fast and easy as possible with detailed guides for each required boss!

• All common and most uncommon junk can be dropped from defense missions/designated matches.
  
• Some uncommon and rare junk can only be dropped from the space monster defense missions (Space sheath monster core / Space peacock monster core)
  
• Some rare and super-rare junk can be found from getting gold in lvl. 3 volunteer missions. It can also drop from bosses, but it's seriously not recommended to farm them this way as they can appear instead of the super-rare that's unique to the boss.

No.49 80 Chip: (Only if you're missing collectibles, as this chip alerts you when search objects [kittens,moais,trees,cards] are close but only while on foot)

• 5x Copper Ore - (common)
  
• 5x Vinyl Doll - (common)
  
• 1x Indecipherable Stone Tablet - (uncommon)

No.2 Great Chip-EX: [15% DMG UP & 10% DMG Taken ]

• 6x Silver Ore - (common)
  
• 6x Vinyl Doll - (common)
  
• 6x Chicken Feather - (common)
  
• 2x Minoru's Drive Gear - (uncommon - Dropped from missions that contain Minoru's)
  
• 2x Baseball Bat - (uncommon)
  
• 1x Diamond - (super-rare)

The diamond can drop from some lvl. 3 lawn mowing or mining volunteer missions, try another lvl. 3 mission if you don't get it, and try farming the same mission if you get the drop from it if you need more.

No.8 Dyna Chip-EX: [15% DMG UP to normal attacks & 10% DMG DWN to heavy attacks]

• 7x Copper Ore - (common)
  
• 7x Moon Dust - (common)
  
• 4x Baseball bat - (common)
  
• 2x Indecipherable stone tablet - (uncommon)
  
• 2x Destroy Engine - (rare - Dropped from Destroyman true face from spicy difficulty and above)
  
• 1x Death drive Mk-I - (super-rare)

I think you can get death drive mk-I's by making progress in some side-quests [moai's/cards/scorpions]. Also through some bosses, but it's heavily not reccomended to get them this way until getting the Z-Chip.

• Make sure to at least eat some Ikura sushi in the middle of fights to have that extra DPS that will go a long way in shortening the time to kill bosses and the farm in general.

• If possible, also eat the Ebi and Futomaki sushi to recharge your death glove skills to be ready to get out of some sticky situations and to maybe get a mustang or throw-crazy mode in there.

• Your ranking doesn't affect your chances of getting the super-rare junk from a boss, i managed to get one on my first try on a boss while getting a C rank, and on other bosses with many more tries while getting B ranks in between and also when i got their super-rare.
  
  
• Before starting the grind on a particular boss for it's extra-rare reward, make sure to eat in a bugzabro stall to get an aditional buff, then save on your apartment. This way if you don't get any given super-rare reward, when you load your save you will always have that extra eat-in buff.
  
  
• Connecting the burst-attack combo and especially it's final hit will usually net you a slash, and interrupt some bosses attack.
  
  
• Completing the final mission of some side-jobs and finishing side-missions (destroying all moais, collecting all deathman cards, etc.), gives you some super-rare junk that is not exclusive to any boss, but are needed to craft some chips, this way you won't need to farm the bosses any more than you need to, and you will get the other achievements at the same time.

TLDW: Farm all of the bosses listed here, on the time machine, on DEATH difficulty (as that's the only one where the boss-exclusive super-rare drop can happen) starting with Mr. Blackhole.

This is all to get the No.46 Z-Chip, which will remove all cooldowns from our death-glove skills, allowing us to stunlock/keep everything slowed down. Making farming the rest of the super-rare junk a LOT faster and an absolute breeze.

GENERAL TIPS:

• Always save before starting the grind with a particular boss and reload that save if you don't get the super-rare junk, your chances will remain the same and you will have a different shot at getting the super-rare reward.
  
• Make sure to always have a green mode saved up before starting a boss fight to end it up much quicker and safer.
  
• craft and equip 3 chips that amplify your damage as everything in DEATH difficulty one-shots you (preferably the No.02 Great Chip-EX or the No.08 Dyna Chip-EX)

When you manage to get it's super-rare drop (SINGULARITY GENERATION DEVICE), craft the:
No.52 Legend chip

• 6x Baseball Bat - (uncommon)
  
• 6x Rhino Horn - (uncommon)
  
• 6x Space Sheath Monster Core - (rare - Dropped from Space Sheath)
  
• 1x Utopiland Blueprints - (rare - Dropped from Damon from spicy difficulty and above)
  
• 1x Singularity Generation Device - (Super-rare)

With this chip you will stunlock the next boss in the list (the only one in which you cannot use your death-glove on) and make the farming much faster and easier.

You will have to obtain another SINGULARITY GENERATION DEVICE to craft the Z-Chip though, so keep that in mind.

TLDW: dodge her first attack and start smashing the normal attack button when she's vulnerable, you should be able to stunlock her for the entire "fight".

If she gets out of it when up certain corners of the map, jump/follow her to the side and catch her before she attacks to continue the stunlock.

Reload your save / repeat the fight until you get the TWIN FIST BEAST BLOOD CRYSTAL

This is only applicable for bosses that can fall to the ground (Destroyman / Native Dancer, Gold Joe gets back up too quickly from the start)
equip 3 No.02 great-chip EX if possible, and then:

1. As soon as the fight starts use the death kick, death slow and death rain (eat a ikura sushi if you want for a bit more dps), then mash on the boss as you want, but make sure it's in the floor at the end of it.
   
2. Use your charge attack, charge it fully (watch 5 ticks of the battery go down) and unleash it as soon as the boss finishes getting up, it should go back down on the ground with enough time for you to fully charge another charge attack
   
3. Repeat until you can't use the full charge attack, then while it's down, recharge your Katana.
   
4. When the boss gets back up you should be able to use another death kick.
   
5. Repeat from step 1 when the other death skills are refilled, otherwise repeat from 2 until the boss gets up much faster when he's at low/half hp.
   
6. Finish off the boss legitimately, or use your saved up green/purple mode.

TLDW: Replace the Legend Chip for another damage-dealing one and continue

You can block the destroy cannon when he launches 2 electric spheres without taking damage, just make sure to not be close because he usually does a destroy punch as soon as he finishes.

If possible interrupt his destroy buster with a death force.

Reload your save / repeat the fight until you get the DESTROY BRAIN

TLDW: Push Joe to the edges of the arena as much as possible to attack him while he is down.

You can also dodge the stone diamonds by jumping but you need to be a bit precise for that.

For that one polarity attack where he stands still, pick the opposite polarity to get to him and hit him to end the attack.

Reload your save and/or repeat the fight until you get the GALACTIC ROLLING THUNDER RAINBOW

TLDW: Spacing is important in this fight.

Make sure to use your green-mode before or as soon as N.D. activates it's night-reaper mode.

Reload your save and/or repeat the fight until you get the NIGHTREAPER BLADE

TLDW:

• Try to use perfect dodges when S.J is doing a swiping attack while remaining as close as possible to him.
  
• If you interrupt him while he's casting the legendary water attack, the ball of water will still appear and fall down on you.
  
• Try to not interrupt him while transitioning on to the yellow phase as his 1st attack will always be the flat water wheel.
  
• You can Death-kick to also avoid the vertical water wheel.

Reload your save and/or repeat the fight until you get the GRAPE JUICE

After that, you can fight FU in spicy difficulty or above to obtain the remaining Baptiste family secret treasure's needed to craft the No.46 Z-CHIP

TLDW: With all those super-rare's obtained, craft the No. 46 Z-Chip, and then craft and equip 2 death skill chips (preferably the No.12 Death Force Chip-EX or No.11 Death Force Chip 's)

With the Z-Chip equipped, you can now proceed to farm the rest of the super-rare's or any remaining junk needed by stunlocking and/or constantly keeping bosses slowed down with all the death glove skills.

Farm the rest of the bosses necesarry to obtain the No. 45 Tiga Chip, which will give you infinite energy for your katana and make farming the junk for the rest of the chips even easier!

No.10 Death Kick Chip-EX: [death-kick 15% DMG UP]

• 8x World Literature Collection - (common)
  
• 7x Satellite Dish - (uncommon)
  
• 1x Space Peacock Monster Core - (rare - Dropped from Space Peacock)
  
• 1x Deathman Strategy Guide - (Super-rare)
  The Deathman Strategy Guide can drop by finishing the deathman card quest as well

No.12 Death Force Chip-EX: [death-force 15% DMG UP]

• 8x Radio - (common)
  
• 7x Opal - (uncommon)
  
• 2x Gold Magnet - (rare - Dropped from Gold Joe from spicy difficulty and above)
  
• 1x Ohma Tears - (Super-rare - Dropped from Ohma)

No.14 Death Slow Chip-EX: [death-slow 15% SLOW DURATION UP]

• 8x Silver Ore - (common)
  
• 7x Hockey Stick - (uncommon)
  
• 2x Ninja Armor Kevlar - (rare - Dropped from Native Dancer from spicy difficulty and above)
  
• 1x Taxidermy Chupacabra - (Super-rare)

The Taxidermy Chupacabra can drop from lvl. 3 Coast Guard volunteer missions, try another lvl. 3 mission if you don't get it, and try farming the same mission if you get the drop from it if you need more.

No.16 Death Rain Chip-EX: [Death-rain 30% DMG UP]

• 8x Chicken Feather - (common)
  
• 7x Jackal Fang- (uncommon)
  
• 2x Kimmy's 2nd Single - (rare - Dropped from Kimmy Love from spicy difficulty and above)
  
• 1x Twin Fist Beast Blood Crystal - (Super-rare - Dropped from Midori Midorikawa)

No.45 TIGA CHIP: [Infinite Katana Battery]

• 2x Utopiland Blueprints - (rare - Dropped from Damon from spicy difficulty and above)
  
• 1x Nova Rocket Fragment - (Super-rare - Dropped from Damon)
  
• 1x Kimmy's Recorder - (Super-rare - Dropped from Kimmy Love)
  
• 1x Grape Juice - (Super-rare - Dropped from Sonic Juice)
  
• 1x Mark of a ♥♥♥♥♥♥♥ Superhero - (Super-rare - Dropped from FU)

• Charging your katana while death-rain is active amplifies the damage of the projectiles!
  If you pair this up with 2 No.16 Death Rain Chip-EX , every projectile will deal a massive 258 damage (339 if you eat a Ikura sushi) with a fully charged charge-attack.
  
  For this strategy try to always get the boss into a corner and/or slow them first before activating death-rain and charging your Katana. This is because each fully-buffed projectile will make the boss fly about with some exceptions, stunlocking them in the process. So, this is mostly recommended for bosses that you can get into a corner or ones that don't move too much (Mr.Blackhole/Sonic Juice/Henry/Damon/etc.).

Here's an incredibly handy Spreadsheet[docs.google.com] to keep track of all the chips you may be missing and the required junk to craft them, props to Rynoweiss for it!

Also, here's a list of all junk in the game, some are obtained from missions that contain certain enemies, props to HV-Gaming once again for providing these in the final video of the playlist!


Extra info for some junk:

• The Taxidermy Chupacabra can drop from lvl. 3 Coast Guard volunteer missions, try another lvl. 3 mission if you don't get it, and try farming the same mission if you get the drop from it if you need more.
  
• The diamond can drop from some lvl. 3 lawn mowing or mining volunteer missions, try another lvl. 3 mission if you don't get it, and try farming the same mission if you get the drop from it if you need more.

Remember that the super-rare's unique to some bosses can be replaced by these other super-rare's in their drop pool.