Please note: all credit goes to Chancellor Beebuz!
This achievement is a really light and to the point guide on getting the Cookie Monster achievement.
Cookie Monster Achievement Guide
- Locate cookie.
- press either f5 or esc then save.
- Grab the cookie.
- After this reload by either pressing f9 or pressing esc again and loading the game on that save.
- Grab cookie again (Until you earn the achievement).