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