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.