Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Contamination King (30 points)	Awarded to those who have destroyed Grey Lotus in World Mode.
Desert King (40 points)	Awarded to those who have destroyed N-WGIX/v in World Mode.
Frost King (30 points)	Awarded to those who have destroyed Exusia in World Mode.
Marsh King (30 points)	Awarded to those who have destroyed the Spirit Class Moving Fortress in World Mode.
Polar King (30 points)	Awarded to those who have destroyed LiV in World Mode.
Ruins King (30 points)	Awarded to those who have destroyed Scavenger, Hunter, and Predator in World Mode.
Wasteland King (30 points)	Awarded to those who have destroyed To-605A, To-605S, and To-605D in World Mode.