Classic retro car - Successfully complete the the first three levels. Then, change the color of your car to find the classic retro version.
Play as Y the Alien - Collect twenty alien icons in all levels to unlock Y the Alien.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
Learner's Permit (5 points): Defeat any vehicle in any mode.
Charge-Up Trainee (5 points): Fire 10 Charge-Up Attacks.
Whammy Master (10 points): Achieve 100 Whammies.
Grease Monkey (10 points): Collect enough Salvage Points to fully upgrade one vehicle.
Quest > Unleaded (10 points): Complete single player Quest Mode on Easy difficulty.
Charge-Up Pro (20 points): Fire 100 Charge-Up Attacks.
Total Pro (20 points): Destroy 100 cars by 'totaling' them.
Alien Contact (20 points): Collect all 100 'Alien Artifacts' in single player to unlock a secret craft.
Quest > Super Unleaded (20 points): Complete single player Quest Mode on Medium difficulty.
King O' Online (20 points): Win 10 online multiplayer battles.
Quest > High Octane (30 points): Complete single player Quest Mode on Hard mode.
Top Mechanic (30 points): Collect enough Salvage Points to fully upgrade all eight vehicles.
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