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