How do you get defacing royalty in achievement unlocked 3?

To earn the "Defacing Royalty" achievement in Achievement Unlocked 3, you need to find and deface a specific number of royal portraits in the game. Look for portraits that can be interacted with and click on them to deface them. The achievement will unlock once you've defaced enough portraits, typically around 10. Keep exploring the game to ensure you find all the necessary portraits.