After completing a level, tap 'Square or X to cause Jim to say "Groovy!" as many times as desired, delaying the start of the next level indefinitely.
Bin collector - Kill Billy the Bin in New Junk City.
Atom Raider - Collect 100 atoms (without exiting the game).
Atom Jefferson - Collect 500 atoms (without exiting the game).
Canadian stunt - Use the whip to swing from any moose head in Single Player mode.
Banker Whipper - Whip a banker twice in What The Heck?.
Space Collector - Collect more than 100 Blue Orbs (without exiting the game).
Snot a Trophy - Launch the cow in New Junk City.
Groovy Leader - Be 'No. 1' in each PlayStation Network multiplayer level.
Super Space Collector - Collect more than 300 Blue Orbs (without exiting the game).
World Partnership - Complete all the Playstation Network multiplayer game levels.
Superhero! - Get through Single Player mode in Original difficulty in one sitting in under 50 minutes.
Earthworm Never Dies - Clear Single Player mode in Original difficulty in one sitting without losing a life.