Asterigos: Curse of the Stars

I followed this guide for most of the game and this achievement:

https://steamcommunity.com/sharedfiles/filedetails/?id=29770...

This quest has 2 parts. First in Phalan Academy and second in Styx.

One big thing to note is that you can lock yourself out of the achievement following this guide. If Styx is the last area you complete, do not talk to Minerva after your quest says to meet Iranaeus at the Phalan Trail. If you talk to her again after that update, one of the required characters will not be in the shelter because the endgame starts. You can avoid risk if you don't progress Glittering Deeps past the boss or just make sure to do the Styx area before Glittering Deeps.