I have completed the achievement "We Few, We Happy Few..." several times and still the achievement will not unlock. I have already gone through the steps of profile deletion and recovery as well as replayed the campaign multiple times to get it to unlock to no avail. I do show all check marks for the achievement and all the required icons in each chapter. This achievement will not unlock nor will the associated mutator. I am missing out on 50 gamer score as well as game completion because of this issue. Can anyone help me with this problem?