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