1 0 0Actions To unlock this achievement, you need to deactivate the 4th orb located behind the vent (left side of the room), at the 15th checkpoint (watch the video below):Left Behind achievement:Full walkthrough of the game:
0 0 0Actions You can start this at checkpoint 14.Head right and climb the ladders to the first levelHead left and rotate the wooden planks (push them towards the ladders)Use the lever to raise the planks once rotatedClimb higher up the ladders so you can now use the planks to jump across up topPush the safe off the edge, make sure you're not near when you push itGo back down the ladders and into the hole the safe madeOpen the panel on the lower left side in the holeHead left inside to the sphere and remove cylinder for the achievementIf you need more help with this you can follow my video guide below which starts at this point: