Complete the Challenge "Ultimate Sacrifice". Call in a nuke while your team is losing.
Be 10th prestige
to get the harrier moving emblem you have to call in 50 harrier strikes.
Kill Soap
2nd prestige
Call in a Nuke to win the game, when your team is losing fking fat chance though lolz
Get a "Payback" by sticking a Semtex on an enemy
Get a "Payback" by sticking a Semtex on an enemy
get 50 pred misilles
well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
You unlock it by getting to 10th Prestige.
you might like the call of duty wikia (see related link)
I believe you have to finish campaign on any difficulty.