Here is the full list of all 13 Little Dungeon Stories achievements.
Defeat the Scourger for the first time
Win a Fortune Teller game
The doll is in the place
Defeat Ungagh for the first time
You made your own potions
You repaired your own weapons
An improved magic sip
A free win
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!