http://www.xbox360achievements.org/game/call-of-duty/achievements/
There you go bud
The Call of Duty 4 Achievements for Xbox 360 can be found here: http://www.xbox360achievements.org/game/call-of-duty-4-modern-warfare/achievements/
look here http://www.xbox360achievements.org/game/call-of-duty-world-at-war/achievements/
If you want to purchase Call of Duty classic zombie maps, you can purchase them on PlayStation Network.
2003 (:
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
youtube it.
you can find a list of achievements at: http://www.xbox360achievements.org/game/call-of-duty-modern-warfare-2/achievements/ and also a guide for them at:http://www.xbox360achievements.org/game/call-of-duty-modern-warfare-2/guide/
yes it is for single player offline and multiplayer online if by classic you mean Call of Duty 3 see related link
He was a Call of Duty MLG player for OptiC
You get various unlocks for weapons, new weapons, new perks, and camouflage for completing the achievements.
The 2 secret achievements in Call Of Duty 5 can be unlocked by reaching prestige 1 and prestige 10 in multiplayer mode. They are called "It's All about Prestige" and "Go Get Some Sun" respectively.Both achievements are worth 0 gamerpoints.
It can be found on the PlayStation Network for $14.99