This achievement occurs during Episode 5 - Outatime
Once you are back in 1876 do the following:
• Walk left, over to Tannen.
• Interact with Window.
• Walk backwards towards the window.
• Interact with Barrels.
• Interact with Pickle Barrel.
• Interact with Ladder.
• Interact with Sandbags (The 3 that are jumbled together by Marty's feet.)
• Interact with Pallet.
• Interact with Sandbags (Not the one near the edge.)
• Interact with Pallet.
• Interact with Sandbags (Not the one near the edge.)
• Interact with Pallet.
• If you are still on the second floor, you will need to interact with Pallet again to take you back down to the ground. If placing the sandbag already took you down to the bottom floor, then continue to the next step.
• Interact with Sandbag (Do not go back up stairs)
• Interact with Pallet. (Do not go back up stairs)
• Interact with Rope. (Do not go back up stairs)
• Walk back to behind the bar. (Do not go back up stairs)
• Interact with Loose Floorboard. (Do not go back up stairs)
• Walk back to the ladder.
• Interact with Ladder.
• Interact with Sandbag
This will also unlock