Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Get Used To This (10 points)	Suffered your first Game Over.
Just Give Up (34 points)	Died at the hand of the final boss. You were so close!
Thy Will Be Gun (125 points)	Defeat the Alien Priest, rescue President Eagle, and save GunWorld!
What Do We Call The Planet Now? (125 points)	Take the Alien Priest's advice and surrender the crops of GunWorld. Embrace peace for the ages.