Guild Wars 2

I did the quest, to find the pages for the book. And the achievement " Halloween Events completed " . Still reads 0-1. I noticed it has 5 tiers to this. Is this in another Act? Or did the book quest, not count towards this?

I have a similar topic here, with a picture to help explain.

https://forum-en.gw2archive.eu/forum/game/halloween/Special-Event-achievements-not-adding-up-for-Halloween-Achievements-pic/first#post527988

I understand you posted a link to another forum topic. But the other topic, has a external link. Think I will wait for someone from Anet, to answer. Tyvm Terry.