Here is the full list of all 25 Quest of Dungeons achievements.
Beat Game in Easy
Beat Game in Normal
Beat Game in Hard
Beat Game with Shaman
Beat Game with Warrior
Beat Game with Wizard
Beat Game with Assassin
Beat Game in 30m
Unlock a door
Unlock Chest
Buy all stock
Complete a quest
Complete 50 quests
Beat a Boss
Find 50 hidden stash
Pick 1M Gold
You listened until the end
Beat Game in Hell
Defeat 3 ghosts of a past Hero
Beat Rackan Mansion
Beat a Custom game in Hard or above with 10 floors
Beat Game with NecroDancer
Disarm a trap and get loot!
Defeat 20 Bosses
Beat the Rothar Mansion