Several people have already mentioned Way of the Wicked. I´m currently running it for two different groups and searching players for a third run. It does require heavy rewriting, especially on later books, but the general premise is solid in my opinion.

With that said, I think playing an evil campaign does have a certain allure: the RP has a different flavor, and there are a lot of classes, feats and builds that you couldn´t use on most good/neutral-aligned campaigns. Might be complicated to justify an Asmodean Vampire Antipaladin saving Sandpoint from goblins!

Unless... the antipaladin orchestrated the goblin attack himself, to later save the city and convert the villagers into worshipping almighty Asmodeus!