In this video, we learn how to do the Prologue Speed Run achievement in Mirror's Edge. You can unlock this after finishing the main story. The prologue has a qualifying time of three minutes. Rather than jumping to the left, you can jump straight and hang onto ropes. You can also jump along a beam and that will save a lot of time. Make sure you grab the left bar and then you can maneuver around a lot more easily. Continue to run through the level doing a fast speed. Once you are finished, you will get the achievement and be ready to continue to a new level.