Here is the full list of all 15 Among Trees achievements.
Survive for 50 days
Find every flora type
Visit all exploration areas
Sleep for 5 nights in a tent
Survive for 15 days
Build all cabin extensions
Create the wormwood brew
Survive a bear attack
Catch 30 fish in total
Sleep for 1 night in a tent
Harvest a turnip
Catch a northern pike perch
Cook a meal on the stove
Gather 5 golden chanterelles in one day
Survive for 1 day