Hi! I don't know if this is the right place to post my problem.

I've have a really big problem: I can't start the daedric quest "House of Horror" in any way.

I've already contacted the Bethesda customer service and they told me to:
- Clear the chache
- Start from a previous save
- Buy a dog in Banning outside the gates of Markarth

I found some other solution on web (stealthily kill Weylin and/or Margret, etc)...

I tried in every way but nothing: Vigilant Tyranus does not appear nowhere in Markarth or out of Markarth.

So I can't take the Oblivion Walker Achievement: the last one!

Can someone help me?

I can't help you, but this is ironic since I tend to spend my visits to Markarth avoiding that vigilant ("I've already SAID I wouldn't help you, now GO AWAY!" as my characters would put it if they could).

If you're on PC there's probably a way to force it to start.

Ahahah yes very ironic

I'm on XBOX, Unfortunately no code solutions for me...

Check the door to the Abandoned House to see if it's locked. If it is *not* then he's inside. Can't help if it is still locked, however. You'd need access to console commands to force him to appear, or push the quest forward.

Unfortunately the abandoned House is locked. Key requires...

So you actually have done all the others? I ask because for one of the Daedric quests you can get two items (Ill Met by Moonlight, I think), but if you've already done them all then IDK either.

I have read about this possibility too but also in my oldest save file I've done all the other quests

I'm desperate mate... after 420 hours of game I can't take a stupid achievement... and I fear that the only possibility is to restart the game...
I hope for some easy solution or in an official patch, but...