Sage Unlock bugged?

[The Eskimo]

I have completed Chambers of Dissonance on Agony twice now, do people know whether it is bugged? I tried to complete it at first with a random character, and then i read the achievement title, which was called Master Warlock, so i assumed i had to beat it with a Warlock... this didnt work either

[tykandre]

Are you using the Sands of Time?
You have to reach minute 30 in agony, the sands invalidate it at the moment,

[Nugab]

same issue here, my best guess is that I used revive and maybe that invalidates it?