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After unlocking "Green," you will be back at the main menu. Press [ Register or Signin to view external links. ] to Continue (do not select 'Restart').

To unlock this achievement, you must reenter the Greenshift, and to do that, you must first reenter the Blueshift.

If at any point while trying for this you feel you've messed up, or the achievement doesn't unlock, press [ Register or Signin to view external links. ] to exit the simulator and try again. You will remain in the Greenshift.

If the achievement is being stubborn and continually doesn't unlock despite accurately doing the steps below, press [ Register or Signin to view external links. ] and return to the main menu (it's okay to press [ Register or Signin to view external links. ] to lose all your unsaved progress). Select 'Continue' and you will be back at the terminal before you entered the Blueshift.

To enter the "Blueshift":
At the terminal, press [ Register or Signin to view external links. ] to continue. Select 'WOODLAND RIDGE 07 APR 13:42'.

Walk along the path and you will see a woman sitting there. Instead of concentrating on her, turn right to continue down the path until you come to a giant rock with a butterfly sitting on it. Zoom in on the butterfly and you will return to the terminal room in the "Blueshift". Walk back into the simulator and you will loop back to the terminal, but this time there will be a blue butterfly sitting on the screen.

To enter the "Greenshift":
Press [ Register or Signin to view external links. ] to continue and select 'WOODLAND RIDGE 07 APR 13:42' again.

Again, walk along the path and ignore the woman sitting there. Walk up to the giant rock and again zoom in on the butterfly. You now have a limited amount of time to complete the next sequence, about 15 seconds. You will be teleported back to the living room looking at the blue butterfly picture. As quick as possible, run (holding [ Register or Signin to view external links. ] ) down the hallway and into the bedroom and walk through the door at the opposite end. If you did it quickly enough, you will be back at the terminal in the "Greenshift". Walk back into the simulator and you will loop back to the terminal, but this time there will be a green butterfly sitting on the screen.

Now that you are back at the terminal in the Greenshift, you are probably going to need a stopwatch or some other device that keeps time. This achievement is extremely time sensitive so if you don't follow these steps accurately, you will not unlock the achievement and have to start all over again.

To enter the "Whiteshift":
At the terminal, press [ Register or Signin to view external links. ] to continue. Select '431 E TERRACE DR 01 MAY 09:17'.

Note that as soon as you enter the simulator, the clock changes to 9:18.

As you walk into the living room, you will see a clock on the right that says 9:18. Do NOT zoom in on this or else the time will change! On the other side of the sofa is a table (where the flashlight was). You need to open that drawer at exactly 9:19 (or within a second or two). Position yourself so you can see the clock but are close to the table. Refer to the image below for positioning. When you see the clock change to 9:19, as fast as you can, walk over to the table and press [ Register or Signin to view external links. ] to open the drawer.

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Next, you need to wait until the clock changes to 9:20. This is where your stopwatch will come in handy. As soon as the clock changes to 9:20, start your stopwatch. You have 16 seconds to perform your next action, so as fast as possible, run into the bedroom and on the left hand wall in between the picture and the corner (to the left of the bed if looking at it from the foot) is a small hole. You need to zoom in (hold [ Register or Signin to view external links. ] ) on that hole at exactly 16 seconds after the clock turns 9:20 (it takes about 11-12 seconds to get to that position). If done correctly, the hole is replaced by a photo of a child.

Press [ Register or Signin to view external links. ] to exit the simulator. You are now in the Whiteshift. Walk back up to the terminal and there is now a white butterfly sitting on the desk.

Press [ Register or Signin to view external links. ] to continue and select '! File Corru-*(# ???'.

Walk into the simulator. As you walk forward, the achievement will unlock.

Continue walking to the light at the end. Once you walk through the door, you will be back at the main menu.

I have included a video below for further assistance.