Crusader Kings III achievements

Choose a Lifestyle and apply a Lifestyle Perk

Restore the Roman Empire

Sleep with your best friend while having the "Ritualized Friendship" cultural tradition.

Have your Dynasty rule 10 sovereign realms of at least Kingdom tier simultaneously

Create and upgrade a Men-At-Arms Regiment

Appoint a Guardian to one of your children

Construct a new building

As Álmos Árpád, form Hungary and convert to Christianity

Have strong hooks on three direct vassals

While holding any Empire Title, be naked

Have an artifact in every slot in the Inventory and Court

Have a new child