The one achievement I have never been interested in because of the nasty, awful, horrible things you have to do. But with my current char I am considering going for it. Two quests in particular have kept me from ever getting this achievement: A Taste of Death and Boethia's Calling. But I think I have a way to kill two birds with one stone, though I am not sure this will work and need some feedback.

Here's the plan:
1) Bring Verulus to the Shrine of Namira
2) kill him
3) get the ring
4) get Eola as a follower
5) kill the other "guests"
6) take Eola to the Shrine of Boethia
7) sacrifice her there

Questions:
1) According to the Wiki, Eola will turn hostile if you kill the other guests. Does this apply if you have her as a follower? If it does, then can you take her outside, have her wait, go back in and kill them? Will she still be hostile?

2) The wiki also says that if you kill Eola after the quest completes, the quest will be marked as failing. So even though the quest would presumably fail when I sacrifice her, I would still have the ring. Would that be enough to count towards the achievement?

Any other potential problems with this plan?