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