Unable to Unlock Closer Analysis Achievement in Call of Duty Black Ops?

Inu

New member
The other day my firend who comleted the game signed on to my Xbox 360 to play split screen with me, and after he signed off, I was able to unlock veteran difficulty achievements by only playing one of the required missions on veteran, and at first I thought nothing about it. A few days later, after properly finishing the veteran campaign, I attempted to find all of the intel items for that achievement, Closer Analysis, and to my surprise i found my game had been 'infected' with my friend's progress, granting me his inteligence, but causing a major problem. I can't unlock the achievement now because i can't pick up any of the items trhough the campaign now, so what should i do and or who should i contact for support?
 
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