I completed the game on Legendary solo and it didn’t give me the achievement and i went back to see my progress and for some reason it says i didnt do the first 3 levels on legendary. So, i go back and do the first 3 levels on legendary and boom i get the achievement but no helmet unlocked (M.C. Helmet). I have the achievement but halo waypoint says i didnt beat it on legendary also now… Can someone please help me out here