I just finished the campaign solo legendary, but only 4 missions have counted towards the campaign challenges. In the lobby the missions show up as completed. My service record is the same as the challenges, only registering 4.
Anyone know what’s up?
Yup it’s a disgrace, because you was offline when you beat. All that Legendary grinding, achievement pops, short moment of joy thinking you can go equip your Mark VI armor in multiplayer and then 343 slap you in the face and tell you it was all a waste of time 
I’m waiting for this to be fixed before I play any more Halo 4.
Yeah, i did all mine online. and even played Dawn twice, but still it did not pop up as completed. (even having the legendary achievements). And my service record under commendations says only 7, but my service record campaign says 8. Messed up much?
I’ve been having the same problem
I have the same problem i played the whole game co-op legendary on release day and 3 missions didn’t count. Now i have to then over again.
If you are disconnected from the H4 server at the time of completion, it won’t count. You’d have to reconnect to the H4 server and complete the missions again. Happened to me.
If that’s no the problem . . . I don’t know what to tell you.