Here is the full list of all 45 Long Live The Queen achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
You have taken possession of a spare Lumen crystal.
You have survived long enough to see a crown placed on your head.
You have spoken to Adair's father at the gala.
You have faced a civil war.
You have been challenged to a duel.
You have embraced the power of Lumen magic.
You've died at least once. It happens to everyone.
You have forced someone else to get married.
You have been forced into a marriage.
You have faced a vote of no confidence.
You have ordered an execution.
You have challenged someone to a duel.
You have found at least five different ways to die.
You have found eleven different ways to die. That takes dedication.
You have broken off a planned engagement.
You have been sent flowers by a woman.
You have demanded a ransom for the return of a captive.
You have discovered a terrible family secret.
You have made a foreign Duke into your subject.
You have paid out a reward for the death of a fugitive.
You have survived a visit to the Old Forest.
You have hired a Lumen Minister.
You have ordered an assassination.
You have won a naval battle without disturbing what lies beneath.
You have chosen to join a villain rather than oppose him.
You have saved the day with the power of music.
You have sunk a fleet with magic.
You have encountered a monster.
Your actions have caused a couple to divorce.
You have gone to battle with foreign troops assisting you.
You have been blessed by the favor of cats.
You have romanced a commoner.
Your actions have unleashed a creeping shade.
You have faced a commoner uprising.
You have discovered the truth about your mother's death.
You have ordered a human sacrifice.
You have discovered a magical mirror.
You have faced a rebellion in Merva.
You have hired someone to spy for you.
You caused an earthquake in Nova.
You kissed your fiancé before the wedding.
You have poisoned a defenseless chicken.
You have made your cousin into a Lumen.
You have imprisoned your uncle for acts against the crown.
You have chosen to recruit an advisor of your own free will.