Try this method: I finally got this damn game completed now
If for some reason you're glitched even after saving people and it hasn't unlocked try this method. Got it before chapter three.
THIS WILL HOWEVER RESET ALL ACHIEVEMENT progress that you HAVE NOT UNLOCKED
Example: 10/50 kills will turn into 0/50 killed etc
Save this for last if it hasn't unlocked by the time you have done everything else.