Restored the Obsolescence Day sign.
This can be done in the personnel section, inside the administration area. There will be a bunch of letters on the wall, but some are missing. Find them in the bathroom, on the ground near the letters on the wall, fix the sideways "E", and find the "M" in the lounge area. If you have completed the game prior to achieving this, you can reload your game and backtrack from the end to any part of the Tacoma.
See the video HERE for more information.