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

Lightning Rod (6 points): Complete the game with the Lightning. 
Mosquito Wing (7 points): Complete the game with the Mosquito. 
Shinden Striker (7 points): Complete the game with the Shinden. 
Wingman (15 points): Complete 3 levels of the game while playing Co-Op. 
Concerted Combat (10 points): Destroy 30 enemies using a Joint Strike. 
Sharpshooter (10 points): Get a 90% or better accuracy rating. 
Blitz (10 points): Complete the game on the Wing King difficulty setting. 
Fangs Out (10 points): Defeat all of the bosses with an A rating in one play-through. 
Padlocked (25 points): Defeat all of the bosses with an S rating in one play-through. 
Tiger (30 points): Collect 30 medals. 
Shooter (30 points): Complete the game with over 200,000 points. 
Combat Ace (40 points): Complete the game with over 2,000,000 points.