I’m playing all the Halo games on Legendary to get Helioskrill and Legendary Achievements. I recently completed all the missions on Halo 4 and didnt get a Achievement for completing Halo 4 on Legendary. I looked at my Achievement tab and saw that i completed 7/8 missions on Halo 4 on Legendary and when i checked all my missions and it said that i completed all missions on Legendary Solo. Could one if you guys help me out? That would be very awesome, thank you for reading.