some achievements dont unlock

i have completed the halo 2 anniversary campaign (legendary) and the achievements for accesing to the terminals did unlock but the ones for succesfully completing the mission in legendary didnt, although on the main campaing screen it shows that the levesl have been completed. eg. halo 2: 15/15 and when i click on missions each one appears completed in legendary solo , yet the achievements do not unlock.
and i dont know if photos about this can be uploaded :v

Hi there, 343 are currently tracking issues with achievement unlocks here if you’d like to add a reply:
Achievement Progress / Unlock Reports