Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Brawn Over Brains	Kill the Dominator Leader.	150
Bring a Gun to a Knife Fight	Kill the templar.	100
Bug Hunter	Kill hundred Brood Warriors.	50
Burn the Jungles	Defeat the aliens in the jungle campaign.	50
Campaign Completion	Complete the single player campaign.	150
Desert Raider	Finish the desert campaign on Extreme difficulty.	150
First Kill	Kill your first enemy in combat.	25
Head Hunter	Kill the alien commander leading the resistance to the orbital assault.	200
Secure the Portal	Kill the last of the portal guardians and seize control of the portal to the alien home world.	100
Training Wheels Earned	Complete the first mission of the campaign.	25