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