Issues w/ Halo 4 Co-op Campaign Achievements

I’ve Completed the entire Halo 4 Campaign alone on Normal, and now Co-op on Heroic. My friend earned each individual campaign achievement as we were playing, because he hadn’t played it at all yet. We both also earned the achievement, Chief Smash! I was surprised to see that after we completed the final mission, neither him or I earned the achievements for completing the campaign on Heroic co-op, or the overall Heroic achievement.

Thinking maybe I had somehow missed a level, I went to the menu to check my campaign progress. The menu said that I had only completed HALF of the campaign on Heroic, which is not true.

On Tuesday, I decided to do-over a couple levels that didn’t register. I did Forerunner on Heroic. After completing the level, I quit to the menu, and it STILL says I’ve only completed it on Normal! I later checked my achievements, and was shocked to see that my “Chief Smash!” had reset itself!

I’m not sure what’s going on here, but there is obviously something very wrong. I hope someone can help me with this and get things straightened out.

PS: At no time was there a power or internet disruption, nor was the Xbox tipped, bumped, jarred, or affected in any way.

UPDATE: I also realized that on Tuesday I had just hit 9mil cR on Reach, but the next day, I’m back down to about 8.98mil. ???

UPDATE 2: My “Chief Smash!” has been re-awarded, and I’m back to +9mil on Reach. But the Halo 4 Heroic Campaign completion is still incorrect.

We’re going to investigate on our end to make sure the game has registered your completed missions. We will update when we have more info.

> We’re going to investigate on our end to make sure the game has registered your completed missions. We will update when we have more info.

Any chance I could get an update on this?

Hello? I’d like to know if anyone is still working on this… I still haven’t gotten my achievements.

Our records show that you will need to recomplete the missing chapters on Heroic in order to earn the achievement. If these were done while offline, they will not register properly. Please make sure to be connected to LIVE the entire time you are playing.