I may have found a new Bug in Halo 4

So I played co-op campaign with a friend and beat it on legendary. He got the achievements and Mark VI armor but I got neither. Now I have all of the campaign commendations except the last one “Midnight” which is to beat the last mission. Even says in the campaign menu that I’ve only beaten the last mission solo on normal while the rest are legendary on co-op (doesn’t even say I’ve played midnight on co-op). I’ve replayed this on co-op THREE TIMES on legendary and yet it still wont register and give me my achievements and armor and I know I did this while connected to Live because my friend played with me via XBL. Please help, replaying this doesn’t fix this.

Old news TC, no response from 343 yet, be patient.

Edit
My mistake, they have made a statement

https://forums.halowaypoint.com/yaf_postst130475_Issues-being-investigated.aspx

Thanks for the info, sorry. So seeing as I’ve replayed this already and doesn’t work my only option is to sit and wait for them to fix it? Then I do it a FOURTH time to get my content?