Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Alien invaders (25 points)	Finish the co-op campaign.
BOOM! (20 points)	Destroy 6000 objects in the co-op campaign.
Bunker buster (25 points)	Destroy the airbase headquarters during the Hawaii mission before the reinforcements are called in.
Can't touch this (30 points)	Finish a mission without dying even once.
Destruction begins (20 points)	Destroy 5000 enemy ground units in the single player campaign.
Easily distracted (100 points)	Finish all optional missions.
Everything under control (20 points)	Finish a mission with 100% core integrity.
Extra money (25 points)	Destroy the convoy with military resources during the mission in the USA.
Fireworks (40 points)	Destroy 10000 enemy air units in the single player campaign.
Flies are annoying (10 points)	Destroy 3000 enemy air units in the co-op campaign.
Good enough (50 points)	Finish all missions with at least a silver trophy.
Hunting season (10 points)	Destroy 6000 enemy ground units in the co-op campaign.
I'm looking for treasure (40 points)	Destroy 5000 objects in the single player campaign.
It was ugly anyway... (10 points)	Destroy 2500 objects in the co-op campaign.
Kill, crush and destroy (40 points)	Destroy 17500 enemy ground units in the single player campaign.
One shot, one kill (20 points)	Destroy 2500 enemy air units in the single player campaign.
Ready for battle (20 points)	Start a mission with your ship fully upgraded.
Simply the best (100 points)	Finish all missions with a gold trophy.
Something unnecessary (20 points)	Finish one optional mission.
They won't need it anymore (20 points)	Destroy 2000 objects in the single player campaign.
This airspace belongs to us now (20 points)	Destroy 12000 enemy air units in the co-op campaign.
This planet is yours now (50 points)	Finish the single player campaign.
This world is too small for us (20 points)	Destroy 20000 enemy ground units in the co-op campaign.
Tower defense (20 points)	Build all types of towers in one mission.
We might have underestimated them... (10 points)	Finish a mission with less than 10% core integrity.
You shall not pass! (35 points)	Create a 1200 meters long path for enemies during the Canada mission.