This will be one of the last achievements you will unlock. You have to unlock the entire store and backroom. This will take a lot of funds to do by itself. After you have unlocked everything, you will need to take the sledgehammer from outside of the store near the black dumpster. Each pillar will take $4,000 and each beam will take $800. You can check your progress on the pillars on the board you use to purchase the entire store. The white blocks will turn black once the pillar has been destroyed. The beams you will just have to be diligent and make sure you destroy all of them.
This achievement will unlock after you close your store for the night after you have destroyed all of the pillar's and beam's inside of the store.