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