Help completist achivement

help!!! I already completed the completist achievement, but do not unblock me what I can do?

Completely shutdown your Xbox and restart… ( like pull the plug man…)

Now turn it off and restart. I was reviewing in the war diary and on the player sheet it appears that I have 46 collectables, but in my collectables I already have 50. What can I do? I already reviewed each chapter and I can no longer collect any collectable