It was party based
it was in Early Access, but may be out of Early Access by now
devs planned achievements
it was dungeon crawler with custom made characters
it may have word "sign" in the title or maybe "moon"
May have been first person
it was very indie title
I doubt it was on gog, sorry guys, but 100% probable it was steam PC exlusive, not sure on xbox, VR or others.
it was recent title

Nice people at steam found the game.
Dungeon Kingdom Sign of the moon