Back to the Future - Achievement

Easiest way to get the Back to the Future - Achievement

Back to the Future - Achievement

Do the following exactly:

1. In the menu click Free Game
2. Let a map generate
3. Click custom and click settings
4. Make sure the only mod selected is sandbox
5. Click Save
6. Click Start
7. Bottom right corner, click the date, click the year, click on the little arrow and change the year back a few years and you'll earn the achievement, none of this opening a map editor nonsense.

Done.