[2.0.23] Achievements not being awarded for joined players in Multiplayer game

[Pikachar]

While hosting a multiplayer game, I (the host) received achievements, however, none of my friends earned any. I'm not sure exactly when this started taking effect, because they were earning achievements earlier on in the save.
Expected: All players earn achievements for completing appropriate tasks.
Actual: Host only receives achievements for completing appropriate tasks.

In the provided save file, we went to 'Finish the game' and only the host received the achievement.

[Loewchen]

How much did each participate compared to the complete save runtime?

[Pikachar]

Each participant would play drastically less than the host. As the host, I would play for most of the day, mostly just cleaning things up and getting random productivity research done. But this had been happening for quite some time by the time they stopped getting achievements.

[Loewchen]

They are not eligible then. Tell them to open the achievements gui, it explains the details.