Another issue of the World of Warcraft "Asks the Devs" series has been posted. This is the final installation with regard to achievements in the game. The questions run the gamut of whether or not more class-specific achievements will be added to the possibility that achievements will unlock content. Beginning next week, devs will field questions about another topic.
Q: I'd like to see the achievement system become more active and dynamic, will we ever see achievements that unlock quest lines, dungeons, or other Easter egg content as a reward for dedicating so much time in Azeroth? – Grandevil (North America/ANZ)
A: Probably not. As we said above, we want Achievements to feel optional. Some players don’t care for the game of collecting pets or mounts, so they still feel like they can opt out of achievements. If there was a cool quest line involved, then players who felt like they could safely ignore achievements in the past would now have to go back and play catch up. If you are doing achievements today, it should be because you like to do them, not because you’re hoping for some additional reward to materialize in the future.
Read more on the World of Warcraft forum.