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http://en.uesp.net/wiki/Skyrim:Daedric_Quests
I would expect Barbas to be missing from Vile's statue if you killed him.
When one of the relevant quests awards you an artifact, a counter goes up. This counter is what's used to determine when you should get the achievement - the game doesn't care what happens to the artifacts themselves, so selling them isn't a problem.
If you don't really care "how" you get the achievement, then the easy way is to just borrow someone else's save:
https://www.nexusmods.com/skyrim/mods/3034/