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Halo 3 ODST 3rd clue achievement won't unlock!

OP Rozraz

I see that others are mostly having trouble unlocking audio log achievements in ODST. I only have one that won't unlock, Gumshoe. (Find the 3rd clue unraveling the mystery). I really hope all of these "Done! Unlocking..." issues are fixed soon. I plan on getting all of the achievements (25 left), and it would suck to not be able to get 100% over this one achievement that won't unlock, when it clearly says it's 100% completed.
This achievement is also bugged for me. Stuck on "Done! Unlocking..."

Ive tried playing the mission a few times now to repeat the requirements but it still won't actually unlock.