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