The tornado appears shortly after you begin to traverse the empty space using words from the manuscript pages to create a substitute bridge of sorts. Rotating around the tornado are many ‘bridge’ words that can be activated with your flashlight. Simply shine your light on the one closest to you, jump carefully on it, look for a ‘path’ word, shine your light on it, and jump to it. It is important to time your jumps, despite being under a time limit, as it is fairly easy to misjudge and fall. A heavy Taken will attack you on this rather thin path, either run past him in terror or finish him off quickly. Repeat the process for the second level of the tornado. If done in time, the achievement will unlock as you grab for the ladder.