Pass the first Interrogation.
Win your first fight against a higher level enemy.
Inflict more than 1 bunk effect on to a single enemy.
Buy your first item from the shop.
Destroy 50 land destructibles.
Destroy 250 land destructibles.
Destroy 10 Sea destructibles.
Fish out 25 items from the sea.
Open 15 treasure chests.
Get Finn to level 10.
Get Jake to level 10.
Get Marceline to level 10.
Get BMO to level 10.
Revive a hero.
Use BMO's "Analyze.exe".
Complete your first side quest.
Use a pirate lookout.
Unlock a gate with BMO.
Fall in to water more than 10 times.
Free the caged Mushroom people.
Win your first sea battle.
Dock at all the islands.
Use all the pirate lookouts.
Beat the Mother Varmint in battle.
Beat the Fire Giant in battle.
Beat Fern in battle.
Overskronk 4 enemies in a single battle.
Beat 50 enemies in battle.
Light all the braziers in the Fire Kingdom.
Pull the plug!
Beat Uncle Gumbald in battle.
Find the snail.
Complete all side quests.
Restore light to the treasure tree.
Take all the penguins to the tree house.
Collect all other achievements.