As you can see:
I owe my non-WoW-playing readers a post about the achievement system, along with other stuff. The short form is that you get these points for accomplishing discrete tasks. Thus I got 15 points when Spider earned exalted status with the Kurenai, and simultaneously earned another 10 because it was the tenth group she'd gotten exalted with.
The Kurenai are one of the groups that sell mounts to those exalted with them. Check out Spider on her new cobalt war talbuk:
I can't remember right now if this is actually the first time I completed the Kurenai grind, or the second. Still a novelty, in any event, and one I'm happy to have done.