Welcome! Thank you for referring to this guide. Hope this helps you obtain the achievements you're looking for.

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There are 2 achievements under this section:

Survive The Forestㅤㅤㅤㅤㅤ
Finish Game

Complete the game
Any ending can be chosen

Vegan
Play through entire game without killing or eating animals. Alone in Single Player or together in Multiplayer.

Complete the game... with a twist!
Complete the game without killing animals. A tip for this achievement to get it as quick as possible don't bother about building a base, everything you need will be in caves regardless; You'll have tents for sleep, cans for thirst, cannibals and snack bars for hunger.
By being constantly in caves this prevents you from coming into contact with any animals.

There are 2 achievements under this section:

Serial Killer
In Single Player, kill 100 cannibals

In single player?
The strange thing about this achievement is that you CAN earn it in multiplayer but you have to be the host of the world. Anyways, the achievement is self explanatory. If you want to speed up the process, explore all the caves or as many as you can as you're guaranteed to run into some flesh-eating friends there.

Pacifist
In Single Player, don't kill any cannibals for more than 10 days in a row

Become a hermit, or spend time building
Like the achievement above it falsely describes that it can only be achieved in single player. This isn't true as I've gotten this achievement in co-op.
Either spend the 10 days in your base or start a building project to distract yourself.

There are 5 achievements under this section:

Camp Out
Sleep with another player (group sleep)

Sleep together
When in a co op game, in order to sleep all players must vote to sleep.

First Responder
Revive one co-op playerㅤㅤㅤ

Medic
Revive 10 co-op playersㅤㅤㅤ

How to get Achievements
Simply revive a friend (or friends).
If you don't have anyone to do this with, feel free to use the comment section of this guide as a chat to try get people to play together.

Be Nice
Share a food or drink item in MP

How to share items in multiplayer
When you spawn into a multiplayer server, you'll actually get an item which is exclusive to co-op. If you look at your inventory you'll see you have a tin. If you combine this tin with majority of the items in the game you'll be able to hold the tin out in front of a player, and the other player will be able collect the item from your hand.

Be Extremely Nice
Share a weapon in MPㅤㅤㅤㅤ

How to get achievement
Follow the information for the achievement above, combine tin with a weapon and share it to a player.

This section contains 4 achievements:

First Night
Survive 1 nightㅤㅤㅤㅤㅤㅤㅤ

Survive your first night

Survivalist
Survive 5 nightsㅤㅤㅤㅤㅤㅤ

Survive 5 nights

5 Star Hotel
Sleep on yachtㅤㅤㅤㅤㅤㅤ

Where to find the Yacht
Location shown above

Bad father
Survive 100 days without finding your son

Tips for achievement
Although this achievement is self explanatory it takes a very long while. Here's some activities I recommend you to do whilst you wait for the days to go by:

• Building (castle, mansion, house, boat base, massive bridge, barrier)
  
• Obtain all key cave items
  
• Collect all animal heads for 'trophy hunter' achievement
  
• Collect all mutant heads
  
• Eat all mushrooms for 'You are a fun guy' achievement
  
• Find all passengers in passenger manifest

Big Spender
Buy a soda and candy from vending machine

How to get achievement
When you gain access to the facility and go through the vent, you'll come to a cafe room, here you will find vending machines and coffee machines you can drink from. You'll need cash for the vending machine. There are multiple locations within the endgame where you can earn this achievement.

Daily Grind
Drink from coffee machine

How to get achievement
See achievement above

Make It Rain
Set off sprinklers in end game

Sprinkler locations
The facility is built in with sprinklers, however only specific rooms can activate them. There's only a couple rooms I know of that have them. Activate them by shooting a flare from a flare gun at an enemy, molotov or stick on fire. If you know of anymore locations where you can set off the sprinklers do comment below.
Unfortunately I have no screenshots to attach but I have descriptions of the rooms:

• The corridor/enclosure room where you encounter the 'surprise' armsy, if you burn the armsy it should set off the sprinklers
  
  
• When you are going through the offices with automatic sliding doors (where you encounter the first few cannibals in the facility) set the cannibals on fire and the sprinklers should turn on

Gross!
Drink water from cooler that has the lawyer head in it

Cooler Location
Progress through the facility until you come to the pile of bodies shown in the big screenshot. Go past and look out for a blue screen projection with 'hdmi' in the corner. To the left of that you should find an interactable water cooler with a human head in it, drink from it and you'll earn the achievement.

You should be looking for Timmy
Build a gazebo

How to get achievement
The gazebo can be found as a blueprint in your survival guide under the decorations tab. It requires quite abit of resources so be prepared.

Longest Wall
Build a super long wallㅤㅤㅤㅤㅤㅤㅤ

How to get achievement
For this achievement you won't actually have to build the entire wall, all you need to do is get the custom wall out and stretch the blueprint out very far, if you place down a long enough wall you should get the achievement. You are not required to complete the wall.
Achievement doesn't seem to work with defensive walls so use custom walls.

Crafty
Craft all itemsㅤㅤㅤㅤㅤㅤ

All items to craft
This achievement is a little outdated, it requires you to craft 25 items however there are currently 32 craftable items in the game that'll count towards the achievement. Below I'll provide the items that count towards this achievement.

[1] Arrow - 1 Stick, 5 Feathers
[2] Bomb - 1 Booze, 1 Circuit Board, 1 Wrist Watch, 1 Coins, 1 Electrical Tape
[3] Bone Armour - 6 Bone, 3 Cloth
[4] Crafted Axe - 1 Stick, 1 Rock, 1 Rope
[5] Crafted Bow - 1 Stick, 1 Cloth, 1 Rope
[6] Crafted Club - 1 Stick, 1 Skull
[7] Energy Mix - 1 Chicory, 1 Cone Flower
[8] Energy Mix + - 1 Chicory, 1 Cone Flower, 1 Aloe
[9] Fire Arrows - 5 Arrows, 1 Cloth, 1 Booze
[10] Head Bomb - 1 Bomb, 1 Head
[11] Incendiary Spear - 1 Upgraded Spear, 1 Cloth, 1 Booze
[12] Herbal Medicine - 1 Aloe, 1 Marigold
[13] Herbal Medicine + - 1 Aloe, 1 Marigold, 1 Cone Flower
[14] Molotov - 1 Cloth, 1 Booze
[15] Poison Arrows - Any arrows, Any of the following - Twin Berries, Snow Berries, Amanita Mushroom, Jack Mushroom
[16] Pouch - 2 Rabbit Fur
[17] Quiver - 3 Rabbit Fur, 1 Rope
[18] Rabbit Fur Boots - 3 Rabbit Fur, 2 Rope
[19] Repair Tool - 2 Sticks, 1 Rock, 2 Cloth, 10 Sap
[20] Rock Bag - 1 Boar Skin, 3 Rope, 1 Cloth
[21] Rope - 7 Cloth
[22] Small Rock Bag - 1 Rabbit Fur, 1 Rope
[23] Snowshoes - 5 Sticks, 2 Rope
[24] Spear Bag - 2 Boar Skin, 2 Deer Skin, 2 Cloth, 3 Rope
[25] Stealth Armour - 1 Lizard Skin, 15 Leaves
[26] Stick Bag - 1 Rabbit Fur, 2 Rope, 3 Cloth
[27] Sticky Bomb - 1 Bomb, 1 Sap
[28] Upgraded Rock - 1 Rock, 1 Cloth
[29] Upgraded Spear - 1 Weak Spear, 2 Cloth, 3 Bones
[30] Upgraded Stick - 1 Stick, 1 Cloth
[31] Waterskin - 2 Deer Skin, 1 Rope
[32] Weak Spear - 2 Sticks

Crafting Recipes that WON'T count towards the achievement:

Toy - Toy Torso, Head, Left Arm, Right Arm, Left Leg, Right Leg
Flintlock Pistol - Gun parts 1, 2, 3, 4, 5, 6, 7, 8

Unseen
Make and wear stealth armour

Crafting Recipe for stealth armour

• 1 Lizard Skin
  
• 15 Leaves

Handyman
Repair a shelterㅤㅤㅤㅤㅤㅤ

How to get achievement
First of all you'll need to craft yourself the repair tool,
the crafting recipe for the repair tool:

• 2 Sticks
  
• 2 Cloth
  
• 1 Rock
  
• 10 Sap

Once you've done that make yourself a hunting shelter (cheapest shelter that can take multiple hits). Hit it a few times until the shelter becomes crooked, then use the repair tool. (make sure building destruction is turned on in the gameplay settings)

Naturopath
Craft 10 medicine itemsㅤㅤㅤㅤㅤㅤ

How to get achievement
Aside from the meds you can find around the peninsula you can also craft meds, you can craft yourself the herbal medicine or herbal medicine+.
Crafting recipe for herbal medicine:

• Aloe
  
• Marigold

Crafting recipe for herbal medicine+:

• Aloe
  
• Marigold
  
• Cone-flower

Demolition Expert
Knock down 6 or more trees with 1 explosive. Alone in Single Player or together in Multiplayer.

How to get achievement
Ideally you want to use a stick of dynamite, however with the right tree placement, I'm sure you can do it with a regular bomb. Look for extremely closely bundled trees for the best chances of getting this achievement, check extremely tree abundant areas like geese lake (see trophy hunter achievement under 'animals' section) or anywhere near the sinkhole.

Climate Change
Cut down 100 treesㅤㅤㅤㅤㅤㅤ

Don't Save The Forest
Cut down 1000 treesㅤㅤㅤㅤㅤㅤㅤ

Tips for both of these achievements
Getting the first 100 trees should be quite easy as you play the game. For the 1000 trees however that's when the game can get tedious.
There are a few methods to getting these but first,

a couple of notes for the achievements:

• The destroy trees developer console command won't count towards the achievements, you have to actually take the trees down by your own action.
  
• These achievements DO carry across multiple saves so you don't need to stay in the same game you've created mindlessly chopping trees.

Method
This method I found to be the quickest way of getting the achievement that I've personally used, is by using dynamite. If you venture near the sinkhole there are many trees which are bundled close together. Make sure you have a bed near the trees you're destroying - Once you use all your dynamite reload the game, you don't need to save and repeat.
When you take down trees, steam already counts them so you can save and reload and keep taking down the same bundles of trees.

Green Thumb
Grow all plant typesㅤㅤㅤㅤㅤ

How to get achievement
Build a garden and grow each plant using their respective seeds:

• Aloe Vera
  
• Coneflower
  
• Blueberry

You are a fun guy
Eat all mushroom typesㅤㅤㅤ

How to get achievement
For this achievement you need to eat all 6 mushroom types.

Mushroom Checklist:
Edible

• Puff Mushroom
  
• Chanterelle Mushroom
  
• Deer Mushroom
  
• Liberty Cap Mushroom

Poisonous

• Jack Mushroom
  
• Amanita Mushroom

A trend I noticed with other guides about this achievement is that there is little to no information on where to find each mushroom. After some time I have managed to finally put together locations for each mushroom.
NOTE: Some people have said that this achievement has bugged for them and required them to collect all the mushrooms before eating them in one sitting, although this wasn't the case for me, beware.
If this achievement decides to work like normal for you, you won't need to collect the mushrooms you can just eat them from the ground.

Majority of the mushrooms can be found in the northern region, along with the mushrooms listed above you can also find the ocassional deer mushroom here.

Where I found my deer mushrooms, these mushrooms are distinct with their brown colour, you can also locate them commonly around woodlands.

Note: Chanterelle and Jack mushrooms are very similar in appearance, the way to distinguish them is that chanterelles have an indent of the top of their caps whereas jack mushrooms have a smooth top.

This mushroom can be found in a lot of woodland areas, quite easy to spot with its red colour.

Commercial Fisherman
Kill 6 or more fish with a stick of dynamite. Alone in Single Player or together in Multiplayer.

How to get achievement
Go to a lake that is abundant with fish, I recommend geese lake (see 'trophy hunter' achievement for location). Make sure you see all the fish or you can just take a wild guess and throw the dynamite into the middle of the lake.

Fisherman
Catch fish with a trap. Alone in Single Player or together in Multiplayer.

How to get achievement
If you build an animal trap in the water it will turn into a fish trap. Make sure the body of water you place it in has fish, I recommend geese lake as that's where I caught my first fish.

Bite me!
Kill shark. Alone in Single Player or together in Multiplayer.

How to get achievement
You can find a live shark near the yacht, use dynamite or a spear once it gets near the boat, or you can swim to one of the islands to kill the shark.

Monster
Kill a bunny. Alone in Single Player or together in Multiplayer.

How to get achievement
There are a few methods on how to kill a bunny, the first method is using a ranged weapon, they are very fast and hard to hit so this method may not be ideal.

Birdseye
Kill bird with arrowㅤㅤㅤㅤㅤ

Easiest way to get achievement
Build a bird house, birds will always land and you can get an easy shot on the bird. Leaving cannibal corpses is also viable method of attracting birds.

Trophy Hunter
Kill all animal types and display heads

This achievement involves you to kill many animals and harvesting their heads as trophies. To 'display the heads' you need to craft the animal head trophy found on the 3rd page of the furniture section in your survival guide. It costs 1 stick, should be simple enough... Right?

NOTE: The screenshot above is missing the Raccoon head, you will need the raccoon head as well as all the animal heads above

Below I will go in depth on where to find each animal trophy and providing tips where necessary. But before we get into that here's the 11 animals checklist which you need for the achievement (Not all animal species need to be killed).

• Deer
  
• Rabbit
  
• Lizard
  
• Crocodile
  
• Raccoon
  
• Boar
  
• Seagull
  
• Shark
  
• Tortoise
  
• Squirrel
  
• Goose

NOTE: Make sure you bring the animal head to your base and make the trophy asap as animal heads can despawn pretty quickly!

Commonly found in woodlands especially areas with lots of trees, you should no issues finding a deer. If you want a specific location to find deer, try Goose Lake (location below).
^ Goose Lake location

Common in woodlands, difficult to kill though. I recommend using the crafted bow or the slingshot and slow walking as close as you can up to them before shooting. Use the location above if you're still to encounter a rabbit. Rabbit traps are also an option.

Uncommon in woodlands and common in shorelines, if you take a trip down the beach or near a river you should encounter them pretty easily.

Rare in lake areas

Uncommon/Rare, found in woodland areas running around, they have a distinct noise so keep your ears out for that.

Uncommon, found exclusively in the northern snowy region, location below.
^ Snowy northern region where boars can be found (any snow region can work not just this location)

Uncommon in shorelines, make your way down to the beach and you should see a seagull sooner or later, location below.
^ Beach location

Exclusively found on the beach region. NOTE: KILLING A LIVE SHARK WONT GIVE YOU A SHARK HEAD - for whatever reason when animals get submerged underwater after death it doesn't allow your character to loot the animal, even if you drag the carcass out of the water it still won't allow you to take a head. The way the game wants you to get the shark head is to decapitate the already dead sharks found in the shoreline below:
^ The shoreline shark carcass location

To be completely honest I'm unsure of the preferred spawn locations of Tortoises however there are specific types of turtles that only spawn on the beach, you can either kill regular tortoises or beach tortoise to get the same head trophy.

Uncommon in woodlands and pretty much anywhere. I even encountered squirrels in the snowy region, however you will most likely encounter them in woodlands along with the deer... and possibly cannibals.

By far the most annoying animal trophy to obtain, they spawn in geese lake (screenshot below). However there's a catch, they are in the water, and if anything dies in the water, you can't interact with it. So you need to build a foundation stretching across the lake.
Depending where you put the foundation you'll either have to shoot the geese out of the air and have them land on the foundation. Or if you happen to build the foundation where the geese swim you can just spear them and the body will glitch to the top of the foundation.

Spelunker
Explore all cavesㅤㅤㅤㅤㅤㅤㅤ

How to get achievement
If you pull up your survival guide and go to the to do list, you'll see the caves you haven't explored in that game.
This achievement does NOT carry across multiple saves, you need to explore all the caves on one world.

Cave legend for map above

Cave 1 - Dead Cave
Cave 2 - Hanging Cave
Cave 3 - Wet Cave
Cave 4 - Baby Cave
Cave 5 - Submerged Cave
Cave 6 - Lawyer's Cave
Cave 7 - Chasm Cave
Cave 8 - Sinkhole Cave
Cave 9 - Ledge Cave
Cave 10 - Waterfall Cave

All the caves needed for achievement:

• Dead Cave
  
• Hanging Cave
  
• Wet Cave
  
• Baby Cave
  
• Submerged Cave
  
• Lawyer Cave
  
• Chasm Cave
  
• Sinkhole Cave
  
• Ledge Cave
  
• Waterfall Cave

Gabe Fan
Collect all cassette tapes!ㅤㅤㅤㅤ

How to get achievement
There are 6 cassette tapes to find, these tapes are all labelled 'cassette [number]' in your inventory so don't get it confused with the other cassettes you can carry which actually have names.

Good Father
Collect all robot piecesㅤㅤㅤㅤ

How to get achievement
Timmy's Toy - the robot is made up of 6 pieces, the head, the torso, arms and legs of each side.

All the pieces are found in specific parts of caves.

Found in cave 2 (Hanging cave)

Found in cave 1 (Dead cave)

Found in cave 3 (Wet cave)

Found in cave 7 (Chasm cave)

Found in cave 5 (Submerged cave)

Found in cave 7 (Sinkhole cave)

Get Closure
Find all missing passengers

How to get achievement
First of all an item you should have is the passenger manifest. The passenger manifest if located in the plane you start at. This will serve as your checklist for which passengers you have found, each time you find a specific passenger, their name will get crossed out.

Below I have attached a link to all passenger locations. The coordinates are for the developer cheats console which you can copy and paste into the command log if you don't want to run around trying to find the passengers.

All passenger locations Wiki
https://theforest.fandom.com/wiki/Passenger

Boy Scout
Use the compassㅤㅤㅤㅤㅤㅤㅤ

How to get achievement
Easiest way to earn this achievement is to die, you will be dragged into a cave. If you take a few steps down the cave you will see a corpse with a compass. Grab the compass and use it. You can also find the map here.

Demolition Man
Set off 20 bombsㅤㅤㅤㅤㅤㅤㅤ

Crafting recipe for bombs

• 1 Circuit
  
• 1 Booze
  
• 1 Coin
  
• 1 Wristband Watch
  
• 1 Cloth

Step Master
Pass 50,000 stepsㅤㅤㅤㅤㅤㅤ

How to get achievement
The one thing this achievement doesn't specify is you have to own the pedometer and reach 50,000 steps on it. The Pedometer is located in cave 7, you don't have to hold it in your hand for it to count your steps, I recommend you to start a building project as you'll be fetching lots of materials; you'll rack up your steps quicker.

Minor Cannibalism
Eat an enemyㅤㅤㅤㅤㅤㅤㅤ

How to get achievement
When you kill a cannibal you can dismember them with any sharp weapon. You can cook arms and legs, you can either dry the limbs at the drying rack or cook them over a fire. Cooking over fire will be your quickest option.

Major Cannibalism
Eat an entire familyㅤㅤㅤㅤㅤㅤ

Eat some more cannibal limbs

Choppy Chop
Chop up 50 bodiesㅤㅤㅤㅤㅤㅤㅤ

Cut up limbs

Splatter
Killed downed enemy with rockㅤㅤㅤㅤ

How to get achievement
I'm unsure whether this achievement requires you to kill a cannibal with a regular rock or an upgraded rock. Regardless, damage a cannibal until they are laying on the ground but still breathing, finish them with rock. This achievement can be abit buggy sometimes but it will eventually pop.

Thank you for reading the guide, if it has helped you, be sure to show support by liking, favouriting and awarding the guide, if you found any mistakes or would like the guide to be updated in some way, leave a comment and I will make adjustments should they be needed.

Thank you again, take care.