So the past few days iv had free time and i thought id finish halo 4 legendary solo as iv only finished it on normal coop and partly finished it on legendary coop anyway i had the last actual mission left to do then the film end scene at the end and i was finished anyway i find the last terminal and i didnt get the achivevement? so im like um... thats strange maybe they will make the achievement pop at the end of the level with everything else, but no i finish the campaign legendary solo and i didnt get it so im like wtf? so i go into the campaign menu and it showing me that iv only ever played the last 2 missions (well mission and the cut scene) at all all the rest are locked as if iv never watched the first cutscene? how? so im like maybe if i log into multiplayer it will trigger it no its coming up with that introduction tutorial thing as if iv never played before and my colour and customised stuff have been changed back to default what has happen? all i can think of is when they released the new matchmaking update its stuffed up and created so many bugs ! what do i do? and im in the right place to tell this to get this issue fixed and so i can get the achivement and unlock the helmet for online? or?? please help