Chapter 1 - Begins at 03:15
in the video below.
Head forward and keep the blue eyes in sight to keep each gate open and pass through them, strafing through the last door to do so. Head down the stairs and look up at the ceiling to see an eye and keep looking at it while strafing through the door.
*Painting alert - This hallway has Painting number 2 of 5. You need to reload chapters and view them in order to get the final achievement.*
Pull the 1st bookshelf to the left out and look at the eye on the other side while backing through the door. In the next room, use the lever to raise the bluish pillar so that you can see its eye while looking through the two gold rings in the white pillars. Back through the door with it in view, standing on the dais to complete the level and unlock The Narrow Path.