Here is the full list of all 45 The Forest achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Play through entire game without killing or eating animals. Alone in Single Player or together in Multiplayer.
Catch fish with a trap. Alone in Single Player or together in Multiplayer.
Killed downed enemy with rock
Kill shark. Alone in Single Player or together in Multiplayer.
Finish Game
Pass 50,000 steps
Eat all mushroom types
Cut down 1000 trees
Build a super long wall
Explore all caves
Collect all cassette tapes!
Craft all items
Find all missing passengers
Collect all robot pieces
Kill all animal types and display heads
In Single Player, don't kill any cannibals for more than 10 days in a row
Craft 10 medicine items
Repair a shelter
Eat an entire family
Set off 20 bombs
Kill 6 or more fish with a stick of dynamite. Alone in Single Player or together in Multiplayer.
Knock down 6 or more trees with 1 explosive. Alone in Single Player or together in Multiplayer.
Use the compass
Chop up 50 bodies
Sleep on yacht
Share a weapon in MP
Eat an enemy
Grow all plant types
Share a food or drink item in MP
Cut down 100 trees
Revive 10 co-op players
In Single Player, kill 100 cannibals
Kill bird with arrow
Make and wear stealth armour
Kill a bunny. Alone in Single Player or together in Multiplayer.
Survive 5 nights
Sleep with another player (group sleep)
Revive one co-op player
Survive 1 night