Here is the full list of all 18 Forest Guardian achievements.
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Die 20 times from the Frankenstein
Die 30 times from the plants
To reach level 12
To reach level 11
Spend on level 10 for more than two minutes
To reach level 10
To reach level 9
To reach level 8
To reach level 7
To reach level 6
To reach level 5
To reach level 4
To reach level 3
To reach level 2
Shoot 200 times
Level one is started
Start a new game