Another "bug" is the fact that in an achievement chain for hitting X level, I'm missing level 10 in all of them, and I shouldn't have to level a second demon hunter to earn what I already HAD. For example, I have the level 20 and 30 achievements for the Demon Hunter, but not the level 10 achievement.
Apparently I'm missing some bestiary stuff too... Essentially, I can't re-earn achievements that I lost, and it's irritating.
*Waits for Blizzard to delete thread*