So i decided to look for the Audio logs without beating the game first, I did not do them in order, and now i have a problem where I cannot get audio log 28 and 29.
I don’t know why but i went to all the locations where all 29 audio logs are, and i believe 2 of them were not highlighted, does anybody know what i must do?
Play it on COOP and they’ll all be reset and ready for you to grab them all… You’ll have to get all 29 of them again then play through each of the mission on free roam over again (Without leaving the game because progress will be reset again!!), so I recommend just blazing through it on Easy. Once you get to Data Hive the guy that normally dies by the Buggers will live and jump down to follow you. He’ll eventually lead you to the 30th Audio Log and you’ll get your last achievement. I actually have two achievements for two Audio Logs (#7 and #9) that are stuck on, “Done, Unlocking…” so I’m currently just screwed…
> 2625759425619671;2:
> Play it on COOP
Do you mean local co-op or can it be done on online too?
> 2625759425619671;2:
> Play it on COOP and they’ll all be reset and ready for you to grab them all… You’ll have to get all 29 of them again then play through each of the mission on free roam over again (Without leaving the game because progress will be reset again!!), so I recommend just blazing through it on Easy. Once you get to Data Hive the guy that normally dies by the Buggers will live and jump down to follow you. He’ll eventually lead you to the 30th Audio Log and you’ll get your last achievement. I actually have two achievements for two Audio Logs (#7 and #9) that are stuck on, “Done, Unlocking…” so I’m currently just screwed…
I did this and got mine to unlock. I also had a couple people try this method out too and they also said it worked. http://www.xboxachievements.com/forum/showthread.php?p=6680460#post6680460
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yes 
I can happily confirm that if any of your audio logs activated but the achievement didn’t unlock the local co-op method works!