Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
- Home Sweet Home (20 points): Visit every area in and around the tree house.
- I See You (30 points): Use the telescope in the boat to look at three different kingdoms.
- Snail's Pace (60 points): Locate and interact with 15 snails.
- Wrong Number (20 points): Dial 10 wrong numbers on the pay phone.
- Radio Starchie (60 points): Listen to all of the radio broadcasts in the Tree House bedroom.
- Stretch Goals (30 points): Use all four Jake combat forms at least once in the game.
- Combo Time (60 points): Perform a 15-hit combo in combat without being hit.
- New to Ooo (60 points): Say hello to the new character in Ooo.
Additionally, there are 16 secret achievements:
- Cake Plate Quest (40 points): Free Abracadaniel from jail.
- Wizards Only, Fools (40 points): Find a way to get into the wizard "party."
- Sweet, Sweet Magic (40 points): Defeat the wizards and free the kidnapped Candy People.
- Hairy Beast (40 points): Find the hairy beast that has been wreaking havoc.
- Lump Support (40 points): Fix all of the noble deeds that were done incorrectly.
- Long Live The (Ice) King (40 points): Put the king back in charge of his kingdom.
- Dance OFF (40 points): Find a cure for the dancing epidemic.
- Sound Sword Quest (40 points): Find the missing Sound Sword.
- Acceptable Ending (40 points): Defeat Magic Man's latest jerky plan.
- Wet Willie (40 points): Find out why the Fire Kingdom's flames are going out.
- Cracked (40 points): Escape from the dungeon below Billy's Cave.
- Nothung To Lose (40 points): Find the last of the artifacts and seal Billy's Cave.
- Record Loss (40 points): Gather the equipment needed to re-record Finn's record.
- Band Together (40 points): Convince Finn's friends to join the band.
- Reel To Real (40 points): Put Finn's favorite song back onto the record album.
- Flimpin' The Diode (60 points): Correctly guess the Grayble theme.