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.
Change the default name.
Always insult the guards
Finish the game at 100%
Leave Lucius to live your best life
Free Lucius of his curse and remain human.
Stay with Lucius and remain human.
Choose to remain human and be kinky.
Free Lucius of his curse and become a vampire with him.
Don’t skip the credit
Stay with Lucius and become a bloodthirsty vampire with him.
Skip the bard song.
Insist your name is Lucius
Cuss out a vampire (use profanity as name).
Always make fun of the guards.