Here is the full list of all 24 Adventure Time: Finn and Jake Investigations achievements.
Find the last of the artifacts and seal Billy's Cave.
Escape from the dungeon below Billy's Cave.
Find out why the Fire Kingdom's flames are going out.
Defeat Magic Man's latest jerky plan.
Find the missing Sound Sword.
Find a cure for the dancing epidemic.
Put the king back in charge of his kingdom.
Fix all of the noble deeds that were done incorrectly.
Say hello to the new character in Ooo.
Visit every area in and around the tree house.
Find the hairy beast that has been wreaking havoc.
Find a way to get into the wizard "party."
Defeat the wizards and free the kidnapped Candy People.
Perform a 15-hit combo in combat without being hit.
Free Abracadaniel from jail.
Use all four Jake combat forms at least once in the game.
Use the telescope in the boat to look at three different kingdoms.
Gather the equipment needed to re-record Finn's record.
Convince Finn's friends to join the band.
Put Finn's favorite song back onto the record album.
Correctly guess the Grayble theme.
Locate and interact with 15 snails.
Dial 10 wrong numbers on the pay phone.
Listen to all of the radio broadcasts in the Tree House bedroom.