2500 Headshots ( yes i did say headshots :D )
I have it its pretty epic
Xbo Live Gamer Tag: FLuX SteaLth
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killing ur self ten time lol xd
when you are level 4 you unlock the intervention and 50 cal.
Which one?Gold: unlock all attachmentsGrey/Silver: 500 kills (need to be prestige)Grey/Silver with headshot icon: 250 headshotsWhite Skulls: 2500 killsGold Skulls: 1000 headshotscheck here for all the titles and emblems: http://callofduty.wikia.com/wiki/CallsignsYou have to get 10000 kills with the intervention.
Achieve 1000 headshots with the ACR. You must be prestiged at least once to unlock this challenge.
Reach Prestige 1 and Level 69.