If there cold be a way that modpack developers could give players a trophy or an item when an advancement is made that would be huge. I'd love to have a trophy room where players need to fill certain ones to advance further in the pack.

There is an Advancement mod called Custom Achievements that does this via JSON file but that isn't getting to 1.12 anytime soon. It basically gives a small trophy with custom defined block and the player's name on the pedestal.

Pretty sure @davqvist said he was going to update, but if he want to he can PR it in.

Yeah, I definitely working on an update.

Closing this since Custom Achievements is getting an update, and I don't wanna "steal" features