?? so was it all true.. did the leaker get everything right? i haven't finished every quest or found every new feature yet on DB just wondering if anyone else can confirm that all the leaks were truth.

yes

no, only the ones over at skyrimforums by sean_ were
Some of the ones by that "my friend told me over xbl" guy were fake, ones that were right were deathbrand, spears as arrows and werebear encounters

Sean_ was spot on.

Yes. He the leak of the achievements were spot on accurate.