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