Complete each achievement to get the allotted gamerscore.

Achievement - How to unlock

Ace Wingman ( 20 points ) - Finish Co-op game on Hard
Alien Eradicator ( 10 points ) - Earn 5 Stars on all 25 Levels on Normal
Combat Pilot ( 10 points ) - Finish Solo game on Normal
Communications Officer ( 10 points ) - Complete Level 5 in an Xbox LIVE Co-op match
Earth Defender ( 10 points ) - Earn 5 Stars on any Level, on any Difficulty
Flight Commander ( 20 points ) - Finish Solo game on Hard
Hero of Vanguardia-7 ( 35 points ) - Earn 5 Stars on all 25 Levels on Hard
Invincible ( 30 points ) - Finish game without losing a life
Prototype Pilot ( 5 points ) - Complete Level 2 on any Difficulty
Scourge of the Skurgians ( 20 points ) - Achieve 10,000,000 points
Squadron Leader ( 10 points ) - Finish Co-op game on Normal
Survivor ( 20 points ) - Complete 5 Levels without losing a life