I had all 3 buffs, the 4th buff from the 4th keg, and the last room didn’t open up for me multiple times. I’ve followed guides, watched videos and still the last room would not open for me. This has cost me 1200g in ‘unlimited drink’ tickets and a lot of wasted time and frustration.
I have a screenshot to prove it.
Also, I have to say that the entire design of this quest is frustrating. I get that these are achievements and meant to be challenging, but an extra minute on the buffs wouldn’t break the game. For a game that claims to ‘respect players time’ this quest amongst others clearly does not respect my time.