Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Annihilator	Destroy 10,000 enemies.	50
Back To Basics	Score 10,000 points on any Classic mode difficulty.	100
Boom!	Destroy 8 enemies with a single Bomb explosion.	10
Bullet Collector	Hold 100 or more bullets at any given moment.	25
Defender	Absorb 1,000 weapons.	10
Defenses Down	Survive without shielding for 20 seconds.	25
Destroyer	Destroy 1,000 enemies.	10
Dynamic Arsenal	Absorb every weapon type.	10
Endless Retaliation	Score 100,000 points in Endless mode.	100
Executioner	Destroy 100,000 enemies.	100
First Of Many	Win a boss fight.	25
Game Over	Run out of lives in Story mode.	10
Guardian	Absorb 10,000 weapons.	50
Hot Streak	Destroy 100 enemies in a single life.	25
New Paint Job	Use the Hangar to customize your ship.	10
Perfect!	Get 100% on any Trial mode level.	100
Pow!	Destroy 10 enemies with a single shield use.	10
The Best Offense	Activate your shield 10,000 times.	50
The Hero's Journey	Score 750,000 points in Story mode.	100
Try Try Try Again	Respawn 100 times.	10
Vindicator	Absorb 100,000 weapons.	100
Woosh!	Destroy 8 enemies with a single Aerodive use.	10
You Win!	Complete Story mode.	50
Zap!	Destroy 8 enemies with a single Laser use.	10