Here is the full list of all 26 Munchkin: Quacked Quest achievements worth 1,000 gamerscore.
Unlock your first card
Win a game without any loot equipped!
Win your first game
Kill your first Boss
Be the only one alive in a room
Kill 1000 monsters
Destroy 100 pieces of furniture
Tackle 25 fellow Munchkins
Gain more than 1500 gold by selling loot during a Dungeon run
Finish a trap layout without taking any damage from traps
Finish a pit layout without falling into a pit
Change your race [4] times during a Dungeon run
Finish a room without taking any damage
Use every consumable in the game
Equip every loot slot during a single Dungeon run
Activate each class ability at least once
Kill 25 enemies by pushing them into a pit
Shield bash at least 50 Monsters
Kill 25 fellow Munchkins by pushing them into a pit
Unlock half of the cards
Unlock all the cards
Play a Full Epic card dungeon
Grab 50 ducks
Feed the Pit at least 25 times
Use every type of weapon in a single Dungeon run
Kill the [4] bosses