Here is the full list of all 14 Ballads at Midnight achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Finish the game at 100%
Free Lucius of his curse and become a vampire with him.
Leave Lucius to live your best life
Always insult the guards
Free Lucius of his curse and remain human.
Choose to remain human and be kinky.
Stay with Lucius and become a bloodthirsty vampire with him.
Don’t skip the credit
Stay with Lucius and remain human.
Skip the bard song.
Change the default name.
Insist your name is Lucius
Cuss out a vampire (use profanity as name).
Always make fun of the guards.