I wasn’t trolling.
If OP really wants pre-Cata Hillsbrad, you are right; it’s not available.
And you are also right
that there is no Alliance quest achievement.
But if OP says they are showing in his achievements, he must be looking at a Horde.
Now, as far as I know, Hillsbrad was not affected by the Arathi phasing, so maybe I’m wrong about that. I haven’t been through Hillsbrad in a LONG time.