Here is the full list of all 43 Choice of the Petal Throne achievements.
Visit the capital.
Fail a lover.
Inspire great loyalty.
Talk your way out of imprisonment.
Lose the battle at Sangmiré.
Fight in the line at Sangmiré.
Escape your arranged marriage.
Refuse an unjust marriage.
Prove yourself able to lead soldiers.
Fight a duel.
Pay shámtla to settle a murder.
Make a big mistake.
Romance priests of Dlámelish.
Help a family member out of hot water.
Help a family member in need.
Complete both Family First achievements.
Challenge any who insult the honor of your legion.
Honor your arranged marriage.
Fight upon the officers' platform at Sangmiré.
Take Sangmiré by subterfuge.
Prove a strong ally in battle.
Anger your superior.
Get court-marshaled.
Win the battle of Sangmiré.
Get help from an unexpected source.
Resurrect a companion.
Give a great sacrifice to a god or goddess.
Fight a legendary monster in single combat.
Learn of the past and the Tree of Time.
See the world.
Return home victorious.
Bring your family safe through war.
Perish in service to your heir.
Rest in the heaven of your god or goddess.
Be banished to the hell of your god or goddess.
Keep Heréksa Rayána alive.
Take an eye for an eye.
Turn the other cheek.
Marry your clan-cousin, Wave.
Marry your second-in-command, Rayána, despite her low birth.
Marry your fellow kási, Nirún.
Marry Wave, Rayána, and Nirún.