Here is the full list of all 25 The Thin Silence achievements.
Finish Part 1: Murmurs
Maybe this'll do it...
Have you tried turning it on and off again?
Collect all chapters of "A Letter to The Sick and The Dying" by Dr. Shavi Mantha
Finish Part 2: Echoes
Finish Part 3: Doubt
Finish the game
Collect every note
Exhaust dialogue for everyone in Fort Vasu
Exhaust dialogue for everyone in the Commune
Visit every room in Facility M18
Read all the emails in Facility M18
Read all the emails about Asha's Escape
Read all the emails about Renaud Gustav
Watch all the CCTV footage
Use Professor Litigano's machine
Find the map system
Find the developer's PC
Congratulations! You're an idiot!
Tried to set the world on fire
Died from falling
Tried over 30 passwords
Stood in ankle deep water too long
You (probably) drowned
Always hopping