Here is the full list of all 25 Quest of Dungeons achievements.
Defeat 20 Bosses
Beat Game with Shaman
Beat Game with Warrior
Beat Game in Easy
Beat Game with Wizard
You listened until the end
Beat Game in Hard
Beat Game in Hell
Pick 1M Gold
Find 50 hidden stash
Complete 50 quests
Buy all stock
Beat Game in Normal
Beat Game with Assassin
Unlock Chest
Unlock a door
Complete a quest
Beat a Boss
Beat Game in 30m
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!
Beat the Rothar Mansion