Expert (challenges)

Expert Challenges are weapons challenges in Call of Duty 4: Modern Warfare, Call of Duty: Modern Warfare 2 and Call of Duty: World at War, earned by achieving a certain number of kills by headshots with a given weapon. In Call of Duty 4: Modern Warfare and the sequel Call of Duty: Modern Warfare 2 they unlock weapon camouflage for primary weapons, but in Call of Duty: World at War, they merely reward experience points.
== Unlockables ==
===Call of Duty 4: Modern Warfare===
Items/XP unlocked after 25 headshots
Digital Camouflage / 100xp
Items/XP unlocked after 75 headshots (50 for shotguns)
Blue Tiger Camouflage / 500xp
Items/XP unlocked after 150 headshots (100 for shotguns)
Red Tiger Camouflage / 1000 xp
When all of the Marksman and Expert challenges for a weapon class (Assault, SMG's, etc.) are completed, the golden weapon for that weapon class is unlocked. The only exception is the Golden Desert Eagle, which is unlocked by reaching level 55 in Call of Duty 4: Modern Warfare. The golden gun in each weapon category are as follows:
==== Golden Guns ====
Assault
AK-47
SMG
Mini-Uzi
LMG
M60E4
Shotguns
M1014
Sniper Rifles
Dragunov
===Call of Duty: World at War===
There are no weapons camouflage skins in regular Call of Duty: World at War multiplayer. Instead, the player only gets experience points for completing the Expert Challenges. Although, in the Zombies level Der Riese, when a weapon is put in the Pack-a-Punch Machine, the gun gets a completely different look to it, namely, multiple strange engravings covering any metal finish of the gun. This has caused many players to ask Treyarch to patch multiplayer to have Pack-A-Punch skins as unlockables, though Treyarch has made no response.
Items/XP unlocked after 25 headshots
100 xp
Items/XP unlocked after 75 headshots
500 xp
Items/XP unlocked after 150 headshots
1000 xp
===Call of Duty: Modern Warfare 2===
Call of Duty: Modern Warfare 2 brings back the gunskins, or camos, but does not include the famous gold skins from Call of Duty 4: Modern Warfare. Each primary weapon, excluding the Riot Shield, can be fitted with a camo.
Woodland Camouflage - 5 headshots
Digital Camouflage - 15 headshots
Urban Camouflage - 30 headshots
Blue Tiger Camouflage - 75 headshots
Red Tiger Camouflage - 150 headshots
Fall Camouflage - 250 headshots
Category:Call of Duty: World at War Multiplayer Challenges
Category:Call of Duty 4: Modern Warfare Multiplayer Challenges
Category:Call of Duty: Modern Warfare 2 Multiplayer Challenges