How to level world of warcraft achievements fast?

that game as good as it is, is just such a waste of life. do something better with your time

Choose the achievement, then look up the goal on wowhead and see where it is or the fastest way to get it. Other than that, just do them, one at a time. There's no particularly fast way, and really no one is going to notice them other than yourself, and they don't really do anything for your character, so really only do them if you have nothing better to do.