Earn the indicated amount of points in Campaign mode to purchase the corresponding cheat at the "Extras" menu.

Mirror Mode: 30 points.
Enemy Secondary Fire: 45 points.
Enemy Super Weapons: 45 points.
Bloody Hell!: 10 points. Enemies will exploded. Alternately, deploy 10,000 troops in Global Resistance at myresistance.net.
Immersive: 45 points. No health or ammo information will appear.
Health Regen: 120 points.
All Weapons: 300 points.
Infinite Ammo: 400 points.