Free Russell and Kevin, then escape the Dirigible.

Collect 6000 Merit Badges in the game to become the Merit Badge Champion.

Unlock the Bonus Art.

Defeat either the giant Anaconda or Crocodile with 2 players.

Swim through all of the areas that have water.

Avoid being captured by Muntz's dogs.

Successfully defend against 10 dog ambushes.

Use Carl's House to float across all the chasms in the game.

Survive against the hungry Piranhas.

Find the voice in the mist.

Squish 10 Wasps and Spiders.

Tie off the house so it doesn't float away.

Use Russell's Canteen three times.