Here is the full list of all 19 Fit For a King achievements.
Play an anachronistic song.
Get an evaluation of your rulership.
Ordain the bear.
Meet your rival at the summit.
Outspend your rival at the summit.
Make your rival cry.
Reform the church.
Meet the leader of a distant land.
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.