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

Mission All Completed (10 points): Complete all the missions.
All Completed without Continue (25 points): Complete all missions without continuing.
Point Hunter (20 points): Earn over 3,000,000 points.
Mission 1 Master (10 points): Complete Mission 1 without any misses.
Mission 2 Master (15 points): Complete Mission 2 without any misses.
Mission 3 Master (20 points): Complete Mission 3 without any misses.
Mission 4 Master (20 points): Complete Mission 4 without any misses.
Final Mission Master (40 points): Complete Final Mission without any misses.
Save President (10 points): Save the President in the mission.
Hyakutaro Ichimonji (10 points): Save Hyakutaro Ichimonji in the mission.
No More Weapon (10 points): Complete any mission without getting power-up items.
Strong Zombie (10 points): Defeat the Boss while the player is a Zombie.