Here is the full list of all 18 Force of Nature achievements.
Die first time
Get level 2
Kill 20 rabbits
Sleep 10 times
Eat 100 coconuts or bananas
Grow 500 roses
Beat the game in Hardcore mode
Get Force of Nature shard
Beat the game
Cut down 1000 trees or bushes
Destroy 100 rocks
Kill 2500 enemies
Kill 15 goblins
Kill 1000 goblins
Run 42km
Grow 1500 wheats
Grow 100 sunflowers
Die 10 times