Scattered throughout the Police Station, there are Wooden Boards which you can use to barricade the windows of the first floor. Although hard, you can technically miss this trophy if you do not use them before entering into the Sewers.

To get this trophy, you must board up any window in the game with a wooden board. Wooden boards can be found throughout the game, and can be easily spotted with the yellow tape covering it. Simply pick up the piece of wood and add it to your inventory. Now that you have a wooden board in your inventory, you can go up to any window and it will prompt you to press  to open your inventory and place the board. The point of the board is to prevent enemies from breaking through. After boarding up your first window, you will get this trophy.