Not unlocking achievement

So I have beaten halo 4 solo legendary it didnt give any of the achievement except for the mission achievements. I loooked to see what missions i was somehow missing even though it showed i did them all in game, and i did those missions on legendary again. So what is the problem? do i wait for an update to somehow fix it. I want my achievements!

Hi surfer i had the same problem with halo3 and1. If you go to your player id the avatar unlock page and scoll trough the mission avatars.
You will probably find one of them not unlocked. Replay the mission on legendary and it will unlock.
In halo ce i had to replay two betrayals al the way, and with halo3 the ark level.
And also to be safe skip the cut scenes. And when you go to your dashboard or pause to long restart the last checkpoint. And finish the mission in one playtrough.
thats what i did and got the achievements
gr mii

I have the same issue, this is actually a 343 issue not an xbox live issue. They are suppose to be addressing this soon.

I have similar issues, in that Halo 2 Cairo Station level completion won’t unlock, despite now having the achievements of completed Halo 2, completed all campaigns at normal (amazing how little time one has when children are involved).

same with halo 4 and 2A not getting completion unlock or the nameplates for it, the latest update didnt fix it :confused: