Here is the full list of all 11 Thalamus achievements.
Play Thalamus for the first time.
Enter Rayans mind and remember the past
Fall to your death, what a poorly designed vent system.
Look at the credits on the main menu
Take the documents from the big boss
Land a shot on the basketball net in Rayan's office.
Be a Chad and use the office bathrooms
Find King Nathans ancient Crown. I believe it was lost in the basement lab....
Find an unknown device. What could it of been used for before.
Wake up from your dream.
Complete Chapter 1 In Thalamus