That is the most bullshit achievement on Earth.
Bungie kept boasting about the small percentage of Reach players who beat the campaign on Solo Legendary. I don't think they understand that percentage pails in comparison to the small number of CoD4 players who could beat that mission on Veteran.
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I've done it its the only game I've got all the achievements for. It was tougher than Halo Reach on Legendary.
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I have yet to beat it :(