Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Gentleman's Agreement (60 points)	Complete Campaign Act II.
Bring the Bleach (20 points)	Use C4 to gib three attacking guards simultaneously without dying in single player.
Dem Bones (10 points)	Revive an online teammate.
I Work Alone (60 points)	Complete Campaign Act I Single Player.
Massacre (20 points)	Kill everyone in a mission.
Silent Withdrawal (20 points)	Complete Banque Albert without being seen.
Slippery (10 points)	Finish The Prison Break with a score under 1:10.
Technician (20 points)	Finish any mission in single player with only wrenches.
Time To Retire (80 points)	Achieve all four trophies on every solo and co-op mission.
Unscathed (40 points)	Complete each mission once without dying .
Whacked (40 points)	Win an online PvP match.