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

Complete Level 1 (10 points): Make it all the way through level 1.
Complete Level 2 (15 points): Make it all the way through level 2.
Complete Level 3 (15 points): Make it all the way through level 3.
Complete Level 4 (20 points): Make it all the way through level 4.
Complete Level 5 (20 points): Make it all the way through level 5.
Complete Base Level (25 points): Successfully destroy the enemy base.
Refueling (10 points): Destroy 10 or more fuel containers on level 1.
Co-op Brilliance (20 points): Obtain a score of 30,000 or more while playing an Xbox Live co-op game.
It's a Mystery (15 points): Destroy 3 or more mystery objects.
Bombing Run (10 points): Destroy 30 enemies without using your forward shooting weapon.
Sharp Shooter (10 points): Destroy 30 enemies without once dropping a bomb
Perfection (30 points): Complete the entire game without losing any lives.