- Sparty Boy 117
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omg... You are really -blam!- late, aren't you? This problem was addressed at least two years ago. The problem, is that the gamerscore has to come from the majority of the original non-DLC achievements. Try to unlcock one of the older achievements, and you'd might get it unlocked.
For more info, go to the halo 3 forum, and look at some of the threads in the pinned topics section, they might help.