Here is the full list of all 17 Forestation achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Make the duck quack
Pass all forest levels
Pass level 30 successfully
Pass all levels by 100%
Find all secret trees
Pass all swamp levels
Find 25 secrets trees
Pass all desert levels
Stop 25 times
Pass 10 levels
Find 10 secret trees
Stop 10 times
Find the first secret tree
Unlock all 10 islands
Pass the first level
Visit the game between December 31 and January 3.