Here is the full list of all 16 Dungeons of Mysteria achievements.
Completed your first Floor
Retired your first character
Earnt 2000 gold with a single Character
Earnt 5000 gold with a single character
Completed your first Dungeon
Killed a Hydra
Defeated a Lich King
Defeated 100 Snakes
Defeated 100 Zombies
Reached the tenth floor in Endless Mode
Reached the twentieth floor in Endless Mode
Completed the Bestiary.
Completed the main story.
Looted an item from a grave
Drank a bottle of Rum