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

Silver Star (30 points): Clear all missions under the Easy difficulty setting.
Gold Star (30 points): Clear all missions under the Normal difficulty setting.
Master Assault Soldier(Single) (40 points): Defeat 30 opponents without dying as an Assault soldier.
Master Sniper(Single) (40 points): Defeat 30 opponents without dying as a Sniper soldier.
Certificate of the Single mode (40 points): Achieve a certain evaluation level in a single play mode.
Sharpshooter(Single) (20 points): Defeat 20 opponents consecutively with head shots.
Ace Pilot(Single) (20 points): Defeat 30 enemy MSs while piloting a MS.
Main Pilot(Single) (20 points): Defeat 10 enemy MSs while piloting a MS.
King of Heart(Single) (20 points): Defeat 10 enemy MSs using only melee weapons while piloting a MS.
Platinum Star (50 points): Clear all missions with HARD difficulty setting.
New Type(Single) (100 points): Destroy 50 enemy MSs without dying while piloting a MS.
Master of Assault Soldier(Multi) (30 points): Defeat 10 opponents without dying as an Assault soldier.
Master Sniper(Multi) (30 points): Defeat 10 opponents without dying as a Sniper soldier.
Master of Combat(Multi) (30 points): Defeat 10 opponents without dying while using Anti-MS & Tanks.
Veteran (60 points): Participate in 100 game sessions.
Master (100 points): Participate in 500 game sessions.
Vehicle Expert(Multi) (20 points): Defeat 5 enemies without dying while using vehicles.
Sharpshooter(Multi) (20 points): Defeat 10 opponents consecutively with head shots.
Ace Pilot(Multi) (20 points): Defeat 10 enemy MSs while piloting a MS.
MS Hunter(Multi) (20 points): Defeat 3 enemy MSs without using vehicles.
King of Heart(Multi) (20 points): Defeat 10 enemy MSs using only melee weapons while piloting a MS.
Dreadnought (30 points): Finish 10 game sessions with the top score.
Predator (50 points): Finish 30 game sessions with the top score.

Additionally, there are two secret achievements, both of which are currently unknown:

Secret achievement (60 points): Unknown.
Secret achievement (100 points): Unknown.