In order to change the color schemes of your ranch house, tech, and vac pack you'll need to unlock chroma packs. In order to unlock chroma packs you'll need to get to level 5 of the 7Zee Rewards club. The 7Zee Rewards club doesn't become available until day 7 in game. It will cost 7,750 Newbucks to get to level 5 in the Rewards club.
Once you've unlocked the chroma packs a terminal will appear against the wall of the ranch house, next to the front door. Simply press
to interact with this terminal, and use each of the three tabs to modify the color palettes of all three. After that the achievement is yours!
Here's my video for all achievements if you'd prefer. Skip to 7:13 for Color Me Impressed.