Call of Duty: Modern Warfare 2 Challenges

Call of Duty: Modern Warfare 2 has many challenges to help players rank up. Below is a list of all of the different categories.

Challenge
Riot Shield

Shotguns

 * Ranger and Model 1887 attachments are only: Akimbo (10 kills) & FMJ (50 kills)

Handguns

 * The .44 Magnum and Desert Eagle have only FMJ, Akimbo, and Tactical Knife for its attachments. The kills required for them are the same, except for the Tactical Knife which needs 100 kills to unlock.

Launchers

 * The launchers, although possessing their own titles, do not have emblems - even though the game tells the user so. This can be confirmed by noticing the lack of Launcher emblems on the Callsigns page.
 * The Stinger is the only launcher that the player must shoot down helicopters to fulfill the challenge. Stinger Veteran IV challenge = 5000 helicopters.

Operations - Section unlocked at Level 10
Asterisk (*) = Challenge unlocked at Level 11

Killstreak - Section unlocked at Level 16
NOTE:Kills got with the initial airstrike from Harrier strike count towards Precision Airstrike challenges instead of Harrier challenges. Asterisk (*) = Challenge unlocked at Level 21

Precision - Section unlocked at Level 26
Asterisk (*) = Challenge unlocked at Level 31

Finishing Moves - Section unlocked at Level 35
Asterisk (*) = Challenge unlocked at Level 37

Humiliation - Section unlocked at Level 41
Asterisk (*) = Challenge unlocked at Level 43

Elite - Section unlocked at Level 53
Asterisk (*) = Challenge unlocked at Level 57

Intimidation - Section unlocked at Level 61
Asterisk (*) = Challenge unlocked at Level 64

Note: Many of the "Kill X enemies with a single killstreak" challenges can be achieved by getting a multi-kill using guns or equipment then very quickly getting another multi-kill using the killstreak such that both multi-kills add up to X.

Prestige
These challenges are unlocked after Prestiging once. All of the challenges related to killstreaks carry over into the next levels of prestige, whereas the "Heads Up!" and the last five challenges (Knife Veteran, Last Stand Veteran, Stealth, Stun Veteran, and Flashbang Veteran) reset after each prestige.

Hidden/Other
These challenges cannot be found in the barracks, but can be completed by playing through multiplayer. These challenges seem to unlock after certain levels, but it is unknown which levels (e.g. Radiation Sickness will not unlock until after level 10). Italics mean unconfirmed names, xp or description. Currently, all of these challenges reset when Prestiging.