No missable achievements (plus 12 unknown)
Sign in with Steam or Xbox to track your progress, and:
Find Slenderman.
Use an healthkit at low health.
Got the SVT-40.
Got the Panzerfaust.
You spared the tourists.
Found the book of darkness.
You did what was necessary.
Schienzel is forever dead.
Beaten the game.
Got the FG-42.
You killed the tourists.
Something is burning...