Talk:Ghost/@comment-31120420-20170122174907/@comment-6716431-20170123004046

I believe the issue here is, as you said, you need to replay the whole game. This achievement's description does seem to imply that just doing each mission in a random order is enough, but I don't think it actually is. This does not include the prologue, but I don't know if you'd have to play that through anyway.