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.
Set off 20 bombs
Find all missing passengers
Revive 10 co-op players
Craft all items
Kill all animal types and display heads
In Single Player, don't kill any cannibals for more than 10 days in a row
Eat all mushroom types
Repair a shelter
Share a weapon in MP
Revive one co-op player
Killed downed enemy with rock
Share a food or drink item in MP
Sleep with another player (group sleep)
Eat an entire family
Craft 10 medicine items
Catch fish with a trap. Alone in Single Player or together in Multiplayer.
Grow all plant types
Build a super long wall
Explore all caves
Cut down 1000 trees
Collect all robot pieces
Kill shark. Alone in Single Player or together in Multiplayer.
Collect all cassette tapes!
Knock down 6 or more trees with 1 explosive. Alone in Single Player or together in Multiplayer.
Pass 50,000 steps
Finish Game
Chop up 50 bodies
Kill 6 or more fish with a stick of dynamite. Alone in Single Player or together in Multiplayer.
Make and wear stealth armour
In Single Player, kill 100 cannibals
Kill bird with arrow
Cut down 100 trees
Sleep on yacht
Use the compass
Eat an enemy
Survive 5 nights
Kill a bunny. Alone in Single Player or together in Multiplayer.
Survive 1 night