I completed Halo 4 Spartan OPS on legendary in Koop. The achievement, for completing all missions on legendary, heoric and normal stuck by 94 percent.
I checked every mission. They all say, that every mission was completed. I received all achievements for completing each episode. I can’t find the missions, which are not counting. I checked the progression after playing episodes 7,8,9 and 10 and the counting for the achievements worked. The problem must be in Episode 1,2,3,4,5 or 6, because I was not checking the progression at this time. I replayed episode 1, 2 and 3, nothing changed for the progression. What is wrong? After playing all this time, I would like to get the achievements.