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