Every time I put in the right code for armor in halo way point it doesn’t work and it keeps on saying that I don’t have the achievement and that I did not complete halo 4 on Legendary. For proof that I beat the game on Legendary I have both of the achievements on my account and it still keeps on saying that I don’t have it.
Hey Ghost, I checked out your service record but it doesn’t list you as having completed any of the missions at all. Were you connected to xbox live while you were playing? If not, you would need to complete them again while connected to live so they they register correctly. The code will work after that 
I was doing it offline.
Thanks the help stckboy
I’m going to beat it again when I have Xbox live again.