Here’s an update for you.
It seems like people are able to continue the campaign past a certain point. This will be a short and a long explanation. There are multiple hidden criteria for completing the achievement “Sojourner of Revendreth”, specifically in the chain connected to “The Final Atonement”.
I am certain most of you will find that you have completed every available quest, but still can’t get this flagged as complete. The reason why is that the NPC “The Accuser” is nowhere to be found to hand out the quest, which is likely the result of the “Hunting and Inquisitor” /script print(C_QuestLog.IsQuestFlaggedCompleted(57929)) being incorrectly completed. During the quest you are supposed to interact with a spirit that’s being Sired by The Accuser (if memory serves). This doesn’t happen automatically and you have no indication that this is what you need to do. That means that the dungeon quest “Halls of Atonement: Your Absolution” /script print(C_QuestLog.IsQuestFlaggedCompleted(58092)) remains incomplete and will not be offered by any NPC.
You can, however, get the quest shared by other party members. So the only workaround is to find some poor lad or lass with the quest and beg, threaten or pay them to share it with you.
Good luck!