Here is the full list of all 43 Choice of the Petal Throne achievements.
Fight a duel.
Pay shámtla to settle a murder.
Refuse an unjust marriage.
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.
Fail a lover.
Prove yourself able to lead soldiers.
Challenge any who insult the honor of your legion.
Honor your arranged marriage.
Escape your arranged marriage.
Fight upon the officers' platform at Sangmiré.
Fight in the line at Sangmiré.
Take Sangmiré by subterfuge.
Prove a strong ally in battle.
Anger your superior.
Get court-marshaled.
Win the battle of Sangmiré.
Lose the battle at Sangmiré.
Talk your way out of imprisonment.
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.
Visit the capital.
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.
Inspire great loyalty.