You're a pet and mount maniac. You've hunted down every noncombat pet you can find, gotten a lucky roll on every rare mount you can possibly pick up, and after long last, you've earned both the "Lil' Game Hunter" and "Mountain o' Mounts" achievements. But still, you want more for some reason. More pets, more mounts, more achievement points.
Good news: Bornakk says that there will still be more to find. While he says they won't be upping the achievements every time they bring out a patch that has more pets and mounts to collect, they will definitely add in new achievements periodically for collecting both noncombat pets and mounts (and, though he doesn't say so, we'd assume they'll add in extra rewards besides the achievement points, including extra pets or mounts to be earned at each level).
So if you are in fact a collecting master and have already earned the 75 pets and 100 mounts (a much easier feat than it used to be) for both maximum achievements currently in the game, just be patient. There'll be new goals to go after soon.