Here is the full list of all 19 Dungeon Cards achievements.
Unlock Mage
Create 30 rubies in one game
Unlock Viking
Unlock Assassin
Hit monsters 12 times in a row
Unlock Cactus
Unlock Thief
Unlock Blacksmith
Store 30000 gold
Unlock Vampire
Unlock 5 dungeons
Hit bats 6 times in a row
Unlock Alchemist
Unlock Grenadier
Open 2000 chests
Unlock all powers
Unlock all characters
Get a highscore of 9000
Unlock 15 levels