Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Dead or Alive (25 points)	Pick up 100 Bounties in the Bounty Hunter game mode.
Got Your Back (25 points)	Deny 100 Bounties in the Bounty Hunter game mode.
Enforcing the Law (25 points)	Get 10,000 kills with the Enforcer class.
Operation Successful (25 points)	Get 10,000 kills with the Operator class.
Mechanical Trigger Finger (25 points)	Get 10,000 kills with the Mechanic Class.
Have Some Professionalism (25 points)	Get 10,000 kills with the Professional class.
Tommy's Favorite (25 points)	Earn a Gold Service Star with the M1A1.
Nailed It! (25 points)	Get 100 kills with the Nail Gun.