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.
Gain 5xp.
Ordain the bear.
Fill your chamber with spouses.
Fill your jail with prisoners.
Get a suit of gold for a monkey.
Marry an inanimate object.
Ride a horse.
Have a swashbuckling adventure.
Marry a princess.
Reform the church.
Get assassinated.
Meet the leader of a distant land.
Play an anachronistic song.
Get an evaluation of your rulership.
Get a suit of gold.