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While progressing to unlock this achievement, you will unlock "Illumination" first.

Continuing on after unlocking "The Loop," you will be standing back at the terminal.

After the terminal boots up, it will ask you to press [ Register or Signin to view external links. ] to continue.

Select the memory '431 E TERRACE DR 01 MAY 09:17'.

Enter the simulator, walk through the living room, turn left down the hallway and turn right to enter the bedroom. On the right there is a TV and answering machine on a dresser. Press [ Register or Signin to view external links. ] to listen to the messages. Wait until the [ Register or Signin to view external links. ] prompt appears to end the simulation.
Back at the terminal, select 'ASEMBLANCE OFFICE 18 APR 23:59'.

Walk into the office and directly in front of you on the counter is a clock. Zoom in on it by pressing [ Register or Signin to view external links. ] and it will change from 12:01 to 5:22. Step back and on the desk to the left is a reel-to-reel. Press [ Register or Signin to view external links. ] to start it and just wait until it has completed its cycle. Next, walk behind the desk on the left (the one you walked to for "The Loop"). Sitting next to the screen is a telephone. Press [ Register or Signin to view external links. ] to listen to the messages. When that's done, the [ Register or Signin to view external links. ] prompt appears to end the simulation.
Standing in front of the terminal, reselect '431 E TERRACE DR 01 MAY 09:17'.

Enter the living room and just past the blue butterfly picture, turn right and you will see a clock sitting on an end table. Look at it and press [ Register or Signin to view external links. ] to zoom in and the clock will change from 9:18 to 2:13. Then walk over to the other end table next to the flickering lamp and press [ Register or Signin to view external links. ] to open the drawer. Press [ Register or Signin to view external links. ] again to take the flashlight which will unlock "Illumination."

Turn around and walk down the hallway into the bedroom and walk across to the open door at the opposite end where you will be teleported back to the terminal room. Instead of interacting with the terminal, walk to your left, up the steps and into the darkened hallway. Walk into it and your flashlight will automatically turn on. Continue and on your left is a panel with an electrical shock symbol on it. Press [ Register or Signin to view external links. ] to open it up and when you're able, press [ Register or Signin to view external links. ] again. Wait for about 15 seconds for the AI to shut down and the achievement will unlock.