Achievements not showing

[casian116]

I've been playing with a friend on a modded server I made and I just realized that the only achievements that are showing are the vanilla ones. This wouldn't be much of a problem in itself but Twilight Forest will not let me fight the lich king whilst the achievement from the naga boss hasn't been completed yet. I tried removing the achievements folder from the world folder but that only reset our vanilla achievements.

The server is running on forge-1.12.2-14.23.5.2847. It has all the mods from Sky Factory 4 and none of the achievements the mods would bring are available.

Don't know if it's relevant but here is a picture of the achievements not appearing. Please help me fix this.