Here is the full list of all 9 SINISTRY SILINIUM achievements.
You, at last, have listened to this long introduction in its entirety.
You went down to the basement as quickly as possible.
Your choice brought you here.
You found an old Soviet doll.
You did not commit a single murder.
You killed them all ...
You have completed the game on a high difficulty level.
You got the ammo from the lady.