Here is the full list of all 25 Quest of Dungeons achievements.
Complete 50 quests
Defeat 20 Bosses
Find 50 hidden stash
Beat Game in Normal
Buy all stock
Beat Game in Easy
Beat Game with Assassin
Unlock Chest
Disarm a trap and get loot!
Unlock a door
Beat a Boss
Complete a quest
Beat Game in Hard
Beat Game with Shaman
Beat Game with Warrior
Beat Game with Wizard
Beat Game in 30m
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
Beat the Rothar Mansion