Here is the full list of all 13 Little Dungeon Stories achievements.
Defeat the Scourger for the first time
Some help from God
Win a Fortune Teller game
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
A free win
Defeat the Jazzek for the first time
Defeat Mother Werewolf for the first time
Defeat the great Toxin Gall
You have defeated the Dungeon!