Not Unlocking Lone Wolf Achievement

So I completed every level of the game on legendary and solo. On my service record it shows that I completed each mission solo legendary. My achievement says 73% completed?? I tried a hard reset and nothing happened. It would be great if 343 and xbox live would get their stuff together. Any suggestion besides replaying it all?

No suggestions. That really sucks. To think I was going to go back through and play it on Legendary solo for this same achieve. Rethinking that now.