This achievement can be gained very early in the game. Chapter 1, Scene 2: Trophy Room has you slowly walking through a corridor in first person perspective. As you walk through, some of the animal head trophies hanging from the walls will come to life, giving you a super scary shock, which you can survive by pressing the buttons shown on screen - I believe that the first one is always
, but the others afterwards are random.
One pass through the corridor should give you three super scary shock encounters, each of which counts towards this achievement. Simply replay this scene over again until the achievement pops, or you can even quit as you get near to the exit door and restart the scene. You should be able to get this achievement within ten to fifteen minutes of starting the game.
As pointed out by UNDEADSPYR0, you can access the scene replay option through the bonus challenges, then selecting books and clicking trophy room. The number of shocks on each pass is random, so you can have as little as two shocks and as many as four in a single pass through the corridor.