CellFactor: Psychokinetic Wars

Simply complete TUTORIAL and Challenges 1-10 in the BlackOp Campaign. The hardest challenge, Challenge 10, requires you to get a 10 kill streak. Just play defensively; you shouldn't have too much trouble. Try and grab the super armour at the top of the map, then find somewhere to camp. A good place to camp is at the far ends of the map, above where the flags would be. There are weak armour spawns here as well.