Here is the full list of all 25 Hunchback's Dungeon achievements.
Win a run with Warlock
Win a run on Classic
Win a run on Ghastly
Win a run on Devilish
Have at least 25 health
With a run with Hunchback
Kill 1.000 enemies
Kill 5.000 enemies
Kill 10.000 enemies
Kill 50.000 enemies
Kill 100.000 enemies
Win a run with Magus
Win a run with Mercenary
Play the game
Win a run with Sloth
Win a run with Spellzerker
Have at least 20 Elemental Damage
Have at least 20 Energy Damage
Have at least 20 Esoteric Damage
Win 1 time
Win 10 times
Win 25 times
Win 50 times
Win a run with Zealot