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