This can first be obtained in 6a or 6b. Turn to the left from the start and follow the building to a construction area with a cement mixer. Go passed the mixer to the wall and cement bags. Turn right and follow between the wall and fence to some scaffolding. Walk onto it and follow the planks forward through the ivy. The scaffolding will turn left to follow the building, but directly in front of you will be a plank that extends out. Walk onto it for the achievement.