Complete each achievement to receive the allotted gamerscore.

Achievement	How to unlock
Full Chat ( 70 points )	Build Terry and Clay's toughness to 100%.
Get Good Wood ( 50 points )	In the bike races, whack off 69 bikers with a bat.
One Percenter ( 5 points )	Help Billy get his bike back.
The Lost Boy ( 25 points )	Become leader of The Lost.