So in the Master Chief Collection, I have completed Halo Combat Evolved Anniversary on Normal difficulty, but I have not gotten all the achievements that says that I have completed the missions. For example, I only had the Pillar of Autumn achievement, even though I had completed campaign. I also found a temporary solution for my problem but it did not solve it completely. The solution was to complete Halo CEA on a playlist to get the achievements, I had gotten the achievements for Halo-Assault on the Control Room, but after I had completed the 343 Guilty Spark mission, I did not get the achievement for completing the mission. Please fix this problem.