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