Here is the full list of all 46 Adventure Time: Explore the Dungeon Because IDK achievements worth 1,000 gamerscore.
Fully upgrade Finn.
Complete all of Starchy's Quests.
Fully upgrade Ice King.
Find all of BMO's game cartridges
Complete all of Princess Bubblegum's Quests.
Uncover Bubblegum's dark secret.
Collect every Token
Perform a perfect block
Collect every Sub-Weapon
Entered the Nightosphere
Fully upgrade Marceline.
Complete all of Mr. Pig's Quests.
Complete all of Susan Strong's Quests.
Overcome the Guardians' punishment.
Free Flame Princess.
Survive a Monster Floor.
Eat every Food item at least once.
Free the Earl of Lemongrab.
Locate every Familiar
Complete all of Tree Trunks' Quests.
Upgrade a character's Imagination.
Weather Goliad and Stormo's psychic assault.
Pick up every Item pickup at least once.
Upgrade a Sub-Weapon into a stronger one.
Rescue the Hyoomans.
Assist Gunter with a feisty feline.
Grab 50 Treasures on a single Treasure Floor.
Put Ice King in his place.
Upgrade a character's Focus.
Outrun the stampeding prisoners.
Receive a Curse.
Upgrade a character's Thumps.
Return from the Dungeon alive.
Buy something from the shop.
Upgrade a character's Rowdiness.
Outsmart the Demon Cat.
Complete a Quest for the Princess.
Used a Special Attack.
Max out Jake's stats
Max out Cinnamon Bun's stats
Max out Lumpy Space Princess's stats
Max out Lemongrab's stats
Max out Flame Princess's stats
Travel 15 Floors in one Nightosphere run
Travel 25 Floors in one Nightosphere run
Travel 50 Floors in one Nightosphere run