Accomplish the indicated achievement to get the number of Gamerscore points.

Achievement	How to unlock
Acrobat ( 40 points )	Perform a two stunt combo (Not achievable in splitscreen).
Adrenaline Junkie ( 40 points )	Stay in adrenaline mode for 30 seconds (Not achievable in splitscreen).
Backflip ( 25 points )	Perform a backflip (Not achievable in splitscreen).
Berzerk ( 50 points )	Take down three opponents in a row without crashing (Not achievable in splitscreen).
Big Air ( 25 points )	Stay airborne for 3 seconds (Not achievable in splitscreen).
Boostaholic ( 60 points )	Stay in adrenaline mode for 60 seconds (Not achievable in splitscreen).
Bully ( 30 points )	Take down one opponent (Not achievable in splitscreen).
Crowdsurfing ( 40 points )	Collide with the spectators (Not achievable in splitscreen).
Double Backflip ( 50 points )	Perform a double backflip (Not achievable in splitscreen).
Double Frontflip ( 50 points )	Perform a double frontflip (Not achievable in splitscreen).
Frontflip ( 25 points )	Perform a frontflip (Not achievable in splitscreen).
Frozen ( 50 points )	Hold a stunt for 4 seconds (Not achievable in splitscreen).
Hangtime ( 25 points )	Hold a stunt for 2 seconds (Not achievable in splitscreen).
HeadSplat ( 60 points )	Land on top of another player (Not achievable in splitscreen).
Hoarder ( 30 points )	Unlock half of all unlockables in career mode.
Orbit ( 50 points )	Stay airborne for 5 seconds (Not achievable in splitscreen).
Pack Rat ( 50 points )	Unlock all unlockables in career mode.
Rampage ( 70 points )	Take down four opponents in a row without crashing (Not achievable in splitscreen).
Roadrunner ( 40 points )	Lead a race from start to finish (Not achievable in splitscreen).
Stingy ( 30 points )	Collect $50000 in career mode without spending them.
Untouchable ( 60 points )	Win a career race with your sled intact (Not achievable in splitscreen).
Wire Fu ( 60 points )	Perform a three stunt combo (Not achievable in splitscreen).
Woodcutter ( 40 points )	Collide with 3 trees in a race. (Not achievable in splitscreen)