To unlock Xbox Live Gamer Points, unlock of the following Achievements.

Achievement	How to unlock
Cannibal Run ( 15 points )	Attain a total of 95,000 score on Interval 03.
Crossing Over ( 15 points )	Attain a total of 70,000 score on Interval 06.
Dream Score ( 10 points )	Attain a total of 50,000 score on Interval 08.
Get To The Chopper ( 10 points )	Complete Interval 02.
Homecoming King ( 25 points )	Complete Interval 08.
House Arrest ( 15 points )	Attain a total of 105,000 score on Interval 04.
Magna Slum Laude ( 15 points )	Attain a total of 85,000 score on Interval 02.
Pain, In Bulk ( 15 points )	Complete Interval 03.
Point Authority ( 15 points )	Attain a total of 110,000 score on Interval 07.
Point Taken ( 15 points )	Attain a total of 110,000 score on Interval 05.
Prison Impossible ( 10 points )	Complete Interval 01.
Terminal Victory ( 25 points )	Complete Interval 07.
Through the Haystack ( 20 points )	Complete Interval 05.
Town Hall Beating ( 15 points )	Complete Interval 04.
Trouble Cross ( 20 points )	Complete Interval 06.
Up The River ( 15 points )	Attain a total of 95,000 score on Interval 01.
Yo, Adrian! ( 15 points )	Find something worth punching!