Here is the full list of all 13 Milky Way Prince – The Vampire Star achievements.
Avoid Critical Collapse
Find Anita
All Endings Completed
Wear perfume and see what happens
Ask the tough questions
Refuse to play his game
Try all the offerings at the Moonage Daydream
Save the Milky Way Prince
See the world through his eyes
Find a way to distract him from his thoughts
Shave and see what happens
Pay attention to your companion
Keep an eye on the changes in your room