Hi, I just finished completing the three main zones and was going to do the final mission, but it's not on my map. When I go to Joseph's region and the church, no one's there. All other main mission, side missions, outposts, bosses, etc. have been completed, but no Where it All Began mission. I had previously completed it with a friend in their game, but wanted to do it in my own to get the achievement.
Any advice?