Hello! 343! I need help! I just completed halo 4 campaign on legendary with my friend Skull296000 online, and I didn't get the achievement for it but he did! It keeps saying I completed the last mission midnight on normal when I completed it on legendary, and so I redid the whole mission on legendary over again, and still no achievement if anyone has experienced this problem, please reply to this post. And my gamer tag on Xbox live is Emperor Comando. Please help...