Here is the full list of all 13 Little Dungeon Stories achievements.
You have defeated the Dungeon!
Defeat Mother Werewolf for the first time
An improved magic sip
A free win
You repaired your own weapons
You made your own potions
Defeat the great Toxin Gall
The doll is in the place
Defeat the Scourger for the first time
Defeat the Jazzek for the first time
Some help from God
Win a Fortune Teller game
Defeat Ungagh for the first time