Full list of all 41 Monster Sanctuary (Windows) achievements worth 1,200 gamerscore.
The base game contains 34 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 7 achievements worth 200 Gamerscore.
Uncover the whole map
Deal over 10,000 damage in a single hit
Beat all of Trainer Gotthelm's challenges
Complete twenty five battles in the Infinity Arena OR PvP
Obtain all monsters
Become a Keeper Master
Receive 5 star scores against all Champions
Upgrade 50 pieces of gear
Donate 100 Monsters to the Monster Army
Defeat Marduk
Explore the forbidden catacombs
Enter the Land of Blobs
Uncover the source of Marduk's powers
Win 200 wild enounters
Prove a worthy opponent
Recover long lost treasure
Obtain a shifted monster
Restore balance to the Sun Palace
Pass the Oracle's test
Become A Keeper Lancer
Defeat the Goblin King
Confront the Alchemists in the Library
Achieve at least a 25 x Combo
Receive a Tanuki Egg
Defeat all monsters in a single turn
Evolve a monster
Calm the Blue Caves
Receive a 5 star score in the Champion Challenge
Receive a reward from the Monster Army
Help out a resident of the Sanctuary
Five-star a battle
Discover a hidden room entrance
Complete Old Buran's training
Hatch first monster
Unlock all alternative outfits
Defeat all Legendary Keeper Battles
Fully equip a Bard with instruments
Restore the World Tree and learn about the true form of your Spectral Familiar
Free the Wanderer from their icy prison
Reach max level with a Monster
Tread where no Keeper has gone before