This is a story related achievement which will unlock with natural story progression.
With all the items you have found in the building, you will now need to fix the cart in the garden at the rear of the building. At the front you will need to force the wheel off of the object it's connected to. Take the wheel around to the cart and attach it. You will now need to remove the bricks and push the cart up to the wall.
Once the cart is pushed up to the wall combine the stretcher which you need to collect from the lift, then place it on top of the cart. Now use the hammer to knock holes into the wood. Once you have completed this lengthy task you will be cable to climb up to the first floor. You will need to use the tongs to pull the board off the windows, once inside the achievement will unlock.