No Credit For Campaign Completion

When I look at my Career page it still shows “Highest Difficulty Completed: Unplayed” yet I beat the Halo 1 campaign on Legendary week 1. This isn’t a major bug obviously since it does not involve the actual gameplay, but it is still annoying.
Anyone else have similar issue?

Same happened to me with Halo 2, the Achievements are bugged for a lot of things.

Is there anyway to retroactively fix this or am I literally going to have to beat the game again to activate the achievement once this is fixed?

I’m having a similar issue with Halo 4. I just completed my playthrough, and am not receiving the achievement for completing Midnight, and thus the campaign as a whole. Additionally, my stats here on Waypoint are telling me I have finished Midnight, but not Infinity, which I completed and have the achievement for.

Also I apparently have 100% completion for the achievement Midnight and Herald of the Reclamation, according to both Waypoint and the in-game menu.

I found a solution that worked for me. I went to campaign, selected RESUME which loads ‘The Maw’, press start, scroll over to achievements, select Halo:MCC (obviously), scrolled over and selected the achievement for completing ‘The Maw’, then select SNAP AND PLAY. After I did this the campaign completion achievements started rolling in and my career page updated. I hope this helps!