Here is the full list of all 15 Heroes of Loot achievements.
Unlocked Barbarian character
Buy a titanium shield
Kill a minotaur
Become invisible
Get the "Lens of secret"
Maximise dungeon difficulty
Reach dungeon level 15
Become level 10
Kill a cyclops
Save a lost soul
Upgrade the difficulty of the dungeon
Play in the Arena room
Activate a statue
Drink from the well
Slay 5000 monsters