The over-sized sign is the entrance sign at the start of the "Eight Pages" level. You should encounter a type of cabin with a few collectibles near it. The sign to earn "I...I'll just...take this..I guess?" should be hung on the wall.
Easy "Insta-Killed" Achievement
Play the Genesis level under the Hardcore difficulty setting. Run to find the first page, then find the other pages while looking for Slenderman. Once you see him, run to him to die. Collecting more pages while waiting for him will improve the chances of his appearance.
Easy "Master Pianist" Achievement
Use the piano found in the house during the Prologue a few times until "Master Pianist" is earned.
Easy "Secret Slide" Achievement
During the prologue, go to the slide behind Kate's house. Climb it's steps to reach the wooden fort, then step onto the slide.
Easy "Tangled" Achievement
Reach the burning forest part of the "Arrival" level. Stop moving and allow Slenderman's tentacles to grow and get you.
Easy "Why Am I Still Playing This Game?" Achievement
When attacked by Slenderman in "The Eight Pages" level, you will not be able to pause game play. Repeatedly press [Pause] under the easy difficulty setting when far enough from Slenderman so that he will not kill you if you are at the limit of the "no-pause zone".
Memories secret level
Play the "Flashback" level and enter the wooded area. Search for a teddy bear that is leaning against a tree near the edge of the cliff to your left. It appears before you get to the building with the VHS tape player and television screen. Interact with the bear to start the "Memories" level.
Secret level
Play "Part 1: Prologue" and examine the swing set located to the left of the house. After getting the message, enter the house and play the piano until another message appears. Go to the back room behind the garage and turn on the radio. Take the flashlight, then walk outside and examine the post across the street to find the missing person flyer. Once you approach the flyer, you should die. Note: This may require a few attempts. Once at the main menu again, select "New Game" and the secret "glitched" level will start. The message "I'm lost. Can you find me?" will appear to confirm that everything was done correctly. You will now be able to explore the house. Note: There are three versions of this level.
Various Achievements
Complete the following achievements to unlock Microsoft Gamerscore points.
Achievement
How to unlock
Cry Baby (25 points)
Disrupt Charlie while he's crying at least 3 times.
Fearless (100 points)
Beat the game on 'Hardcore' difficulty.
Fearless Fun (25 points)
Riding a slide in a horror game.
Fire Proof (75 points)
Make it through the forest fire without catching on fire once.
Get Me Out of Here! (25 points)
Exceed 10 failed pause attempts.
I Love Radio (25 points)
Listen to all of the radio tracks in the house.
I'll just take this..I guess? (25 points)
Pick up an oversized sign and somehow manage to fit it in your scrapbook.
I'm Free! (25 points)
Beat the game on normal difficulty.
Insta-Killed (25 points)
We're sorry about that... Here's a cookie!
Master Pianist (25 points)
Play the piano until the first notes from 'No Friends' is played.
Retro Fan (100 points)
Beat the Genesis level on 'Hardcore' difficulty.
Speed Runner I (50 points)
Beat 'The Eight Pages' level in under 5 minutes.
Speed Runner II (75 points)
Beat 'Into The Abyss' level in under 5 minutes.
Speed Runner III (100 points)
Beat the game in under 45 minutes.
Tangled (25 points)
Get ensnared by Slender Man's tentacles.
The Collector I (75 points)
Find all numbered letters.
The Collector II (125 points)
Find all scrapbook items.
Walking Simulator (25 points)
Surpass 10,000 total steps taken.
Well At Least You Tried (25 points)
Die in the 'Into the Abyss' level 3 times in a row.
