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 romanced a commoner.
You have gone to battle with foreign troops assisting you.
You have chosen to join a villain rather than oppose him.
Your actions have unleashed a creeping shade.
You have won a naval battle without disturbing what lies beneath.
You have paid out a reward for the death of a fugitive.
You have discovered a terrible family secret.
Your actions have caused a couple to divorce.
You have broken off a planned engagement.
You have been forced into a marriage.
You have faced a vote of no confidence.
You have challenged someone to a duel.
You have found eleven different ways to die. That takes dedication.
You have faced a commoner uprising.
You have survived a visit to the Old Forest.
You have encountered a monster.
You have ordered an assassination.
You have faced a rebellion in Merva.
You have ordered a human sacrifice.
You have sunk a fleet with magic.
You have taken possession of a spare Lumen crystal.
You have hired a Lumen Minister.
You have found at least five different ways to die.
You have saved the day with the power of music.
You have hired someone to spy for you.
You have been blessed by the favor of cats.
You have discovered the truth about your mother's death.
You have demanded a ransom for the return of a captive.
You have spoken to Adair's father at the gala.
You have survived long enough to see a crown placed on your head.
You have discovered a magical mirror.
You have been sent flowers by a woman.
You have faced a civil war.
You have made a foreign Duke into your subject.
You have forced someone else to get married.
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 ordered an execution.
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.