The Royal Court Add-on for Crusader Kings III has 20 achievements.
Fund an Inspired character's Project, and recieve the end result
Create a Hybrid Culture
Create a Divergent Culture
Have an artifact in every slot in the Inventory and Court
Reach the maximum amount of Court Grandeur
Personally know 10 languages
Sponsor 30 successful inspirations in one game
Obtain a mythological rarity artifact from an Adventurer Inspiration
Rule a realm containing at least 10 cultures with 95% or more acceptance of your culture
Be at least 6 levels above your expected Court Grandeur
As a member of the Pugyel Dynasty, re-create the Empire of Tibet
As the Seljuk Count in Samosata, form Rum and create a Hybrid Culture between Oghuz and Greek
Starting as the Duke of Ghur in 867 or 1066, conquer the borders of the historical Ghurid Empire
As the Piasts in 867, rule a Feudal Poland and own a Famed+ regalia, crown, weapon, and armor
Have every Royal Court speak your Court Language
Starting and staying as a Jewish ruler in East Africa, rule a Kingdom and diverge your culture
Appoint a character with a completed Adventure inspiration as your Antiquarian
Loot an artifact you do not have a claim on and pass it down to your heir
With the County of Fika as your primary title, diverge your culture and spread it to 30 Counties
As a vassal king to an emperor, have a higher court grandeur than they do