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