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%
Stay with Lucius and remain human.
Free Lucius of his curse and become a vampire with him.
Stay with Lucius and become a bloodthirsty vampire with him.
Leave Lucius to live your best life
Skip the bard song.
Insist your name is Lucius
Cuss out a vampire (use profanity as name).
Always make fun of the guards.
Don’t skip the credit
Choose to remain human and be kinky.
Free Lucius of his curse and remain human.
Change the default name.
Always insult the guards