Here is the full list of all 19 Fit For a King achievements.
Get an evaluation of your rulership.
Reform the church.
Ordain the bear.
Meet your rival at the summit.
Outspend your rival at the summit.
Make your rival cry.
Meet the leader of a distant land.
Play an anachronistic song.
Marry a princess.
Ride a horse.
Fill your chamber with spouses.
Fill your jail with prisoners.
Marry an inanimate object.
Have a swashbuckling adventure.
Get a suit of gold.
Get a suit of gold for a monkey.
Gain 5xp.
Get assassinated.
Conquer the known world.