Hey guys and gals! Here is my 100% Achievement guide and full walkthrough for Infliction!
Slightly near the beginning of the game, you will end up going to your basement where you see a big book on the table in an eery environment.
Once you read the book (or even before), before you leave the basement, look to the right wall where the book was to see a little hole.. zoom in on it to unlock this Achievement.
Go to 11:20 in my video, to see where and how this unlocks.
Hope this helps!