Had 4 90's before 6.0.2, then got my 5th shortly after the patch and it did not give me the achievement.
Quintessential Quintet:
"Reach maximum level with five different classes."
I'm going to assume that's because the game now thinks the maximum level is 100, which is why my 5th 90 did not count.
Considering we can only get to level 90 atm, I find this complete BS, either they should specify what level you need to get characters to (aka 100) or fix it so that 90's count up until WoD is released. What does everyone else think?
Was going to post links (including the terrible ticket response I got) but cannot as my account is new.
Edit: verdict: #yoloswagginseleven100sitis