As of Slender: The Arrival's latest update, this guide is outdated. I have remade it in its entirety and added walkthroughs for the new content to it. The updated guide can be found here: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3055045395

WARNING
This guide contains major spoilers for Slender: The Arrival. If this is your first time playing the game and/or you wish to complete a blind playthrough, stop reading now and return once you've beaten the game.

Scrap #1 is unique in that it can be found in three different places throughout the game, but you only need to pick it up once to get the achievement. Two of the three posters are found in the Prologue chapter: The first one is stuck to a tree just in front of Kate's house, and the second can be found on a different tree on the road to Oakside Park. The third poster is located in the Into the Abyss chapter, and can be found at the Kullman Mine's entrance.

Prologue Posters


Into the Abyss Poster



Letter #1 can be found on a shelf immediately after entering Kate's house.



Scrap #2 is located on a coffee table in the living room to the left of the staircase.



Scrap #3 can be found on the table in the kitchen, and Scrap #4 on the refrigerator.




Letter #2 can be found next to a radio in the room across the hall from the garage.



Scrap #5 is found crumpled up behind the trashcan in Kate's bedroom. Look closely, this one blends into its surroundings so it's easy to miss.



Letter #3 is located on the playset in Kate's yard.



Scrap #6 can be found on a cable spool near the first set of work lights on the road to Oakside Park.



Scraps #7, #8, and #9 are all located in the burned house near the end of the chapter. The scorched note and framed picture can easily be discovered by looking around inside, and Charlie's drawing can be found buried in some dirt behind the house.





Scrap #10 is found in the storage yard adjacent to the burned house. Search the supplies on the left side of the yard to find it.



Scrap #11 is impossible to miss, as collecting it is the only way to progress to the next level.

Scraps #12, #13, and #14 can all be found at the first building you see as you make your way into Oakside Park.



Keep in mind that the starting location for this level is randomized, so you'll spawn in one of four different areas every time you play it. However, this doesn't change where the collectibles are located, as each spawn-point has a similar building nearby.

Much like the last level, this one has two different spawn-points that are randomized with each playthrough. To keep things simple, let's start by heading to the dirt road at the center of the map, facing the Kullman Mine.



Head to the left and go around the abandoned shack, making your way toward the rock formation pictured below. Pass through the opening to find Letter #4 stuck to a tree




Go back to the main road and head right. It won't be long before you come across another abandoned building. Letter #5 is sitting on top of one of the barrels nearby.



It's finally time to approach that dark, ominous tunnel up ahead. Make your way to the entrance of the Kullman Mine and look to the right to find Letter #6 and Scrap #15 pinned to a bulletin board.



Scrap #16 is very easy to miss. Search behind the pipes to the left of the entrance to find it.



Letter #7 and Scraps #17 and #18 are all located in the first room you come across after entering the mine. The warning sign is on the chain-link fence right in front of you as you enter the room, the envelope is sitting on a control panel to the left, and the framed article is hanging on the wall at the opposite end of the room.

Letter #8 can be found immediately after the level starts. Look for it on the pile of crates on the right side of the hall.



After leaving the mine, look to the left and make your way up the hill to find Letter #9 attached to a chain-link fence.



Travel along the mountain path until you come across Charlie's teddy bear. Ascend the hill to your right to find Letter #10 stuck to a wooden post at the top.
Side Note: The teddy bear can be interacted with to access a secret level.





After making your way through the cave, Scrap #19 can be seen attached to the outside of the abandoned building. After picking it up, go inside and look to the left to find Letter #11 stuck to a wall.




Scrap #20 is impossible to miss, as once again, collecting it is the only way to advance to the next level.

Head into the farmhouse at the beginning of the level to find Scrap #21 sitting on a table in the first room.




Scrap #22 can be found beside the staircase in the barn.



Scrap #23 is located just inside the doorway of the granary. Ignore the disturbing sounds coming from inside and grab it, but don't go any further into the building.



Scrap #24 is easy to miss thanks to the confusing layout of the cellar. When entering the cellar, go down the stairs closest to the crop field and keep to the right, exploring the small side rooms as you make your way through the underground labyrinth. The book will be on the bottom shelf in the second side room you come across. Keep following the established strategy to find one or both of the gas cans and escape the cellar.



After activating the generator and making your way through the granary, look left at the doorway to find Scrap #25 sitting on a table.



While looking for the gate key in the yard behind the granary, be sure to search the shed for Scrap #26.



Scraps #27 and #28 are both located on individual tables within the chapel. Collecting them before picking up the toys on the floor is highly recommended.




Scraps #29, #30, #31, and #32 can all be found in the attic of the farmhouse. Be sure to gather all of them before dropping down to the first floor.

We've nearly reached the game's finale and only a handful of collectibles remain. Letter #12 can be found attached to some boards as you ascend the mountain.



Scrap #33 is easy to miss since it blends in with the terrain. Make sure you grab it at the cave's entrance.



As you explore the depths of the cave, Letter #13 can be found on top of a cardboard box, and Scrap #34 is attached to some boards near the writing on the walls.




After fighting your way through the inferno and breaking into the radio station, look to the left to see Scrap #35 stuck to the wall.



Letter #? and Scrap #36 can be found immediately after waking up in the basement. Both are located on opposite sides of the room, and for the third and final time, you need to collect both of them to go any further...

Congratulations! If you've followed this guide correctly, you should now have all 50 Scrapbook Items as well as both of The Collector achievements!