Unlock the following challenges by performing the corresponding tasks. Note: These challenges will not show in the barracks:
CHALLENGE - HOW TO UNLOCK Never Forget - Get hurt by an enemy, survive and backstab the same enemy. 3,500 experience points. The Loner - Get a 10 killstreak with no killstreak rewards selected. 2,500 experience points. Infected - Get knifed by an enemy wearing this title. 1,000 experience points. Living Dead - Survive in Final Stand long enough to get back up. 1,000 experience points. Click, Click, Boom - Kill an enemy with C4 while you are in Last Stand (not Final Stand). 5,000 experience points. STD - Transmission Complete (Knife an enemy wearing this title). 5,000 experience points. The Numb - Take enough damage that would normally kill you with Painkill active. 0 experience points. ...With A Vengeance - Avenge a fallen teammate. 0 experience points. Martyrdoh! - Kill an enemy who is priming a grenade. 0 experience points. Ninja - Defuse a bomb right after it is planted while the planter is still alive. 2,000 experience points. Sidekick - Get three kills with your secondary weapon in one life. 1,000 experience points. Renaissance Man - Get three kills with three different weapons in one life. 1,000 experience points. Radiation Sickness - Get nuked by the enemy. 1,000 experience points. 6fears7 - Select killstreak rewards requiring 7, 8, and 9 kills and earn them all. Unknown experience points. Hard to Kill - Get 2 kills while in Last Stand or Final Stand. 500 experience points. The Avenger - Avenge the death of 3 teammates in one life. Unknown experience points. Point Guard - Most assists in a game. Unknown experience points. Martyr - Get a kill with Martyrdom grenade. 1,000 experience points. All Rounder - Complete all other challenges. Unknown experience points. The Edge - I, II, III - Get the Game-Winning Killcam 5, 10, and 20 times. 1,000 experience points, 5,000 experience points, 10,000 experience points. Hijacker - I, II, III - Steal 10, 50, and 200, enemy crates. 1,000 experience points, 3,000 experience points, 5,000 experience points.