Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Alien Destroyer	Kill hundred alien enemies.	60
Alien Killer	Kill fifty alien enemies.	40
Alien Smasher	Kill 150 alien enemies.	90
First Encounter	Defeat the first boss.	90
ID Card	Find the ID Card object.	90
Jet-Pack	Find the jet-pack object.	90
More Power!	Find the second enhancement for the main weapon.	90
Power Up!	Find the first enhancement for the main weapon.	90
Satellite Navigator	Find the map object.	90
Second Encounter	Defeat the second boss.	90
Sonic Boom	Find the secondary weapon.	90
Third Encounter	Defeat the third boss.	90