Vanquish Gnomus, the Gnome King!
Difficulty: Somewhat hard
- RGBY is an acronym of "Red Green Blue Yellow," which is a reference to Sharp's Quattron LCD color display technology, or the order of the colors of the Microsoft Windows 3.x-7 logo.
- Coincidentally, this achievement shares its name with a Customization for the Foot Soldier in Plants vs. Zombies: Garden Warfare.
- This achievement has some part in a Legendary Hat for Citron, "RGBY Cats!".