The Dark Forest Title update for Stacklands has 20 achievements.
Build a Rowboat
Build a Sloop
Unlock all Island Packs
Find Treasure
Kill the Kraken
Kill the Final Final Boss
Make Rum
Get a Villager drunk
Catch a Fish
Befriend a Pirate
Make Ceviche
Build a Greenhouse
Find the Dark Forest
Build a Stable Portal
Fight Wave Six
Fight the Wicked Witch
Build a Smithy
Train an Archer
Make a Villager wear a Rabbit Hat
Have a Villager with Combat Level 20