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