Here is the full list of all 10 Hunchback's Dungeon Demo achievements.
Win a run on Normal Difficulty
Win a run on Hard Difficulty
Win a run on Expert Difficulty
Finish a run with 20 or more HP
Win a run with Hunchback
Play Hunchback's Dungeon DEMO
Win a run with Warlock
Win a run with Mercenary
Win a run with Sloth
Win a run with Spellzerker