Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Bulletproof. Sort Of... (20 points)	Spend 5 minutes using the Ballistic Shield.
Link Repeater (20 points)	Win 2 rounds of Chainlink.
RC Assassin (30 points)	Get 5 kills in a round with the RAWR.
Street Fighter (30 points)	Complete all Dragon's Teeth Assignments.
The Metropolitan (20 points)	Play a round on all Dragon's Teeth maps.