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

Meritorious Achievement Star (50 points): Complete all eight "Wargame" missions without any casualties.
Gold Achievement Star (40 points): Complete any six "Wargame" missions without any casualties.
Silver Achievement Star (30 points): Complete any four "Wargame" missions without any casualties.
Bronze Achievement Star (20 points): Complete any two "Wargame" missions without any casualties.
Operation Blue Bird (15 points): Complete Sniper Role "Wargame" missions.
Operation Brown Bear (15 points): Complete Auto-Rifleman Role "Wargame" missions.
Operation Black Cat (15 points): Complete all Grenadier Role "Wargame" missions.
Operation Gray Wolf (15 points): Complete all Rifleman Role "Wargame" missions.
Distinguished Skill Citation (30 points): Reach Professional level in any two skills.
Meritorious Skill Citation (25 points): Reach Professional level in any one skill.
Gold Skill Citation (20 points): Reach Skilled level in all skills.
Silver Skill Citation (15 points): Reach Skilled level in any three skills.
Bronze Skill Citation (10 points): Reach Skilled level in any one skill.
Distinguished Combat Service (60 points): Win 250 missions (4+ players in game) acting in any Role.
Meritorious Combat Service (45 points): Win 150 missions (4+ players in game) acting in any Role.
Gold Combat Service (35 points): Win 75 missions (4+ players in game) acting in any Role.
Silver Combat Service (25 points): Win 25 missions (4+ players in game) acting in any Role.
Bronze Combat Service (15 points): Win 10 missions (4+ players in game) acting in any Role.
Operation Gold Lion (30 points): Win all missions (4+ players in game) of the Co-op Multiplayer campaign.
Helo Hunter Award (20 points): Destroy 50 Helicopters in multiplayer (4+ players in game).
Tank Hunter Award (20 points): Destroy 50 Ground Vehicles in multiplayer (4+ players in game).
Indirect Fire Support Award (20 points): Distinguished Leadership Award; 100 KIA's by Artillery Strikes in multiplayer (4+ players in game).
Distinguished Combat Medic (50 points): Successfully perform First Aid upon teammates 250 times (4+ players in game).
Meritorious Combat Medic (40 points): Successfully perform First Aid upon teammates 100 times (4+ players in game).
Gold Combat Medic (30 points): Successfully perform First Aid upon teammates 50 times (4+ players in game).
Silver Combat Medic (20 points): Successfully perform First Aid upon teammates 25 times (4+ players in game).
Bronze Combat Medic (10 points): Successfully perform First Aid upon teammates 10 times (4+ players in game).
Distinguished Auto-Rifleman (20 points): Win 25 missions (4+ players in game) as Auto-Rifleman.
Distinguished Grenadier (20 points): Win 25 missions (4+ players in game) as Grenadier.
Distinguished Leadership (20 points): Win 25 missions (4+ players in game) as Team Leader.
Distinguished Rifleman (20 points): Win 25 missions (4+ players in game) as Rifleman.
Distinguished Sniper (20 points): Win 25 missions (4+ players in game) as Sniper.
Meritorious Auto-Rifleman (10 points): Win 10 missions (4+ players in game) as Auto-Rifleman.
Meritorious Grenadier (10 points): Win 10 missions (4+ players in game) as Grenadier.
Meritorious Leadership (10 points): Win 10 missions (4+ players in game) as Team Leader.
Meritorious Rifleman (10 points): Win 10 missions (4+ players in game) as Rifleman.
Meritorious Sniper (10 points): Win 10 missions (4+ players in game) as Sniper.
Combat Injury Star (10 points): Win 25 missions (4 plus players in game) in which you were wounded at least once, but not killed.
Golden Eagle (20 points): Join a Unit (Clan) and win 10 missions (4+ players in game) as a Unit member.
Pistolier Award (M9) (20 points): Win 10 missions (4+ players in game) with an M9 accuracy of 80% or higher (15+ shots fired).
Rifleman Award (M16A4 / M4A1) (20 points): Win 10 missions (4+ players in game) with an M16A4/M4A1 accuracy of 80% or higher (30+ shots fired).
Automatic Rifleman Award (M249) (20 points): Win 10 missions (4+ players in game) where 30+ targets were suppressed with the M249.
Grenadier Award (M203) (20 points): Neutralize 75 targets with M203 grenade launcher in multiplayer (4+ players in game).
Sniper Award (M24/M107) (20 points): Win 10 missions (4+ players in game) with an M24/M107 accuracy of 80% or higher (10+ shots fired).