Has someone had their unlocking issues actually taken care of using this thread? I'm asking because it seems that the problems are persisting but not much is being done by 343i to prevent problems. My last mission which did not unlock was "Regret" from Halo 2, which shows as incomplete even though I completed it. However, the system did record the Assassin's skull achievement which is associated with Regret.
Unfortunately we don't see much if any help or information regarding this. No user feedback weather or not there problems were fixed or not. Since we don't see much feedback either way, I presume not much is done. Only thing we presume is the MS and 343 knows about the issues.
I recommend checking your service record here and on trueachievements.com site. They have a great site and tools to help you figure out what is being unlocked and still locked and progress as well. You can compare both your service record on here, in game and TA to see what your needing. Also check to be sure how your playing the game and configuring the game. If you have invalid skulls or a configuration in the game, this will effect achievements being not unlocked.
If you think your having problems. Remove your profile from the console, then hold and press the power button on the console until the console turns off. Then power back on, then re-add your profile. Then try again. Seen odd issues with profiles becoming corrupt. I was gaming on a play list co op and the game glitched out at the very end of the game. I got botted back to the dash board. I attempted to restart MCC however it would no longer load correctly. WTH. So I found a MS support site saying to remove the profile then re-add it. I did this and then MCC started to load correctly again. Crazy I know.