Here is the full list of all 11 King of Queendoms achievements.
Peace throughout the land
Failed to sign Liliana
Elvira falls in love with you
Sign Liliana to treaty
Facilitated the orange deal
Sign Mathilda to treaty
Proved how bad you are in bed.
Refused to take the oath
Failed to sign Mathilda to treaty.
Gave Elivira some sausage for breakfast
Start the game