Cooperative Advancements is a simple mod that automatically grants advancements to other players on a server whenever someone earns one. It also automatically synchronizes player's advancements whenever someone logs in. Advancement progress is also kept synchronized, so large multi-part advancements (looking at you, Adventuring Time) can be worked on by multiple players at the same time!
By default the mod synchronizes all players on the server, but it can be configured to sync only amongst players that share a team instead.
This mod requires Iceberg, you can download it here.
Client / Server
For dedicated multiplayer, this mod only needs to be installed on the server. For LAN multiplayer, just the host needs to install this mod on the client.
You are free to use this mod in modpacks.
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