Achievements not updating

I, recently, have been attempting to unlock the new helioskrill armor with my brother for halo 5. Anyways, I’ve beaten all of halo one, two and three on legendary. I’ve also beaten 6/10 of the halo 4 campaign missions, on legendary too. Unfortunately, it says I have only 24/40 missions beaten for the veteran, war hero, and legend achievements. I’m assuming the missing levels are from halo two since I also haven’t received those achievements. As I said before, I played with my brother, RayTheSlayer. We played on the same console (split screen) and he has all of the halo two campaign achievements. And his legend achievement shows the correct number of levels completed Once I finish halo 4 will I get the armor? The achievements? I can send pictures of me having beaten all of halo two on legendary. I really don’t want to redo all of halo two, as it took a while. Thank you for any answers.
-InboundLegend7

I looked at your service record. There’s something janky with your Halo CE times on co-op. All times for The Silent Cartographer down are 1:40:39. It doesn’t show anytimes for Halo 2. Tough break. There might have been some communication issues with the server when you played with your brother. IDK. It seems like you’ll have to do those missions again.

So I need to do all of halo 2 and the first few missions in halo CE? It couldn’t be anything with the communication issues because I was playing with my brother, who did get them. could it be a bug? Anyway to look at his service record to see if he played with me and give me the achievements that way also? Very bothered by this because it seems like it is a common problem. thanks

Also, could I just send pictures of the missions I’ve done on legendary?

Hey there. The MCC has been buggy like that. I would redo The Silent Cartographerredo on as well as all of Halo 2. If it doesn’t show up on your Waypoint record then it doesn’t count, pictures aside. It sucks, I know. Check out some speed runs on YouTube (Naked Eli) has some great ones and he explains the methods behind the madness. They look crazy but just run them a few times before you do legendary to get them down. Good hunting.

Alright, thanks