Call of Duty: Modern Warfare 2 Challenges

Call of Duty: Modern Warfare 2 Has many challenges to help you rank up. There are 14 different Categories.

Prestige
These challenges are unlocked after Prestiging once. (Some challenges carried over from First to Second Prestige)

Heads Up!, Knife, Last Stand, Stealth, Stun and Flashbang resets, everything else carries over. (All the killstreak challenges carries over)