I'm Not Even Supposed to Be Here! Trophy in Where the Bees Make Honey

Story-related and cannot be missed.

This is the first trophy you will earn in the game. From the office room, walk forward to the exit door, past the elevator and into the door on the far wall, then go down all the flights of stairs. Open the generator box on the left and flip the switch.

There's a several-second delay for this trophy popping, and it may not actually pop for you until you start going back up the stairs.