Complete each achievement to get the allotted gamerscore.
Deadly tools (30) - Without dying, get a kill with a Carbine, Pistol and Rocket Launcher
Dominator (20) - Win a round in Conquest Domination
Grinding the Crack (20) - Fall over the edge on Ziba Tower
Man of Calibre (20) - Complete a round of Gun Master
Show of Force (30) - Get 10 kills with all ten CQ weapons