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 survived a visit to the Old Forest.
You have encountered a monster.
You have made a foreign Duke into your subject.
You have ordered an assassination.
You have survived long enough to see a crown placed on your head.
You have broken off a planned engagement.
You have been forced into a marriage.
You have faced a vote of no confidence.
You have ordered an execution.
You have found at least five different ways to die.
You have been challenged to a duel.
You have faced a civil war.
You have embraced the power of Lumen magic.
You've died at least once. It happens to everyone.
You have found eleven different ways to die. That takes dedication.
You have been sent flowers by a woman.
You have challenged someone to a duel.
You have demanded a ransom for the return of a captive.
You have discovered a terrible family secret.
You have taken possession of a spare Lumen crystal.
You have paid out a reward for the death of a fugitive.
You have spoken to Adair's father at the gala.
You have hired a Lumen Minister.
You have forced someone else to get married.
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.
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.