I just want to let you know, I'm trying this achievment for 2 hours so far... I did almost all the achievments in the Festival of The Four Wings achievment tab. I tried to stay close to Ellen and Evon, a bit far, can only talk with Evon. I also see people come and get a cinematic. I never watched cinematic. Maybe my bug is because of the reason I was on this map before in 2012 or 2013. I tryed to change different map, other zone, port to the lower WP and come back, went a bit afk. Somehow the cinamatic passed me, few people said they got cutted while watching the cinematic and didn't watch the whole thing, I did not get cinematic at all, and because of that I didn't also get achievment. Hope you fix this issue soon.
Edit: Still bugged after the hotfix update