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.
Always insult the guards
Finish the game at 100%
Leave Lucius to live your best life
Free Lucius of his curse and remain human.
Free Lucius of his curse and become a vampire with him.
Stay with Lucius and remain human.
Choose to remain human and be kinky.
Don’t skip the credit
Stay with Lucius and become a bloodthirsty vampire with him.
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.