Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Lieutenant (15 points): Earned the rank of Lieutenant.
Commander (15 points): Earned the rank of Commander.
Top Dog (25 points): Earned the top rank of Commander Tier 3.
Agent (15 points): Earned the rank of Agent.
Operative (15 points): Earned the rank of Operative.
Specialist (15 points): Earned the rank of Specialist.
Expert Sniper (15 points): Get 100 kills playing the Sniper class.
Expert Support (15 points): Get 100 kills playing the Support class.
Expert Recon (15 points): Get 100 kills playing the Recon class.
King Crusher (25 points): Successfully crushed 30 enemies with structural collapses.
Expert Rifleman (15 points): Get 100 kills playing the Rifleman class.
Expert Gunner (15 points): Get 100 kills playing the Gunner class.