You know, i cleared SoF the week it was released. And guess what? It being adjusted now has zero bearing on my character. None.

I'm glad i had a rush clearing it. And now i can be happier knowing that when my bud gets to that fight, it will be a breeze to get him through and HE will have a blast clearing it.

Adjustments to old content really don't invalidate achievements imo. Or at least they really shouldn't.