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