How to Acquire
To complete this achievement, Corvo Attano or Emily Kaldwin has to make the balcony overlooking the small inner courtyard garden in Stilton Manor crumble down, during the mission A Crack in the Slab. To do so, reach the past using the Timepiece and, when inside the garden, shoot the two red weak fixations under the balcony with any projectile to sever the balcony's foundations. Then, switch to the present and the balcony will have crumbled over the years with a path built from the wreckage. When the protagonist sets foot on the pathway, the achievement unlocks.
This achievement also grants the special action Collapsed Balcony.