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Mile High Club on CoD 4
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Ricocheting a rocket with armor lock in reach to get a kill.
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For me Speed Reader on Halo Anniversary, I suck at grenade jumps on Halo CEA on 360, though I have only ever attempted this on solo. Speed Reader- Complete-Library on Legendary in under 30 mins. The MCC has a par time for every campaign level, though the achievement above no longer exists, they expect you to do it in under 25 mins now, Arrghh!