I have been trying to get the "Oblivion Walker" trophy. I went off to Whiterun to start "The Whispering Door". I don't remember doing it but ages ago I must have killed Hulda (I killed a lot of people in Whiterun, I guess she was one of them). Is there any other way to start the quest? I can't get the quest from Ysolda.

It wouldn't bother me if I hadn't already done half of the Daedric quests, plus if I start a new player I need to get to the right level to start the quests and all that stuff. (Also sorry if this isn't the correct place to post this, it's my first time on the forum)

Welcome to the forums. There is a glitch that will give you the savior's hide and the ring of hircine and both will count. Just make sure you do NOT take the Rueful Axe or destroy the Skull of Corruption and you should be fine.

Thank you Stormwinds. How do I do that glitch?

Save Sinding, finish the quest. After you talk to Hircine go back inside find Sinding and kill him. Hircine will appear again and skin him.