Crusader Kings III achievements

Fully upgrade a Duchy Building anywhere in your personal Domain

Have three or more virtuous traits

Create a Hybrid Culture

Obtain a mythological rarity artifact from an Adventurer Inspiration.

Have your dynasty reach the highest possible Level of Splendor

Use the Claim Throne scheme successfully

Reach the maximum amount of Court Grandeur.

Be at least 6 levels above your expected Court Grandeur

Starting as a Dynasty no higher than Count tier, become Emperor tier

Murder your spouse

Create a Cadet Branch of your Dynasty

Create a Faith