Stunned the same zombie three or more times!
Difficulty: Somewhat easy
Bully was a secret achievement on Plants vs. Zombies Adventures. It required the player to stun the same zombie three or more times. This required both ZombiFreeze to work and 75 sun, as it costed 25 sun to use ZombiFreeze.
The word "bully" is the term given to a person who uses force, threat or coercion to abuse, intimidate or aggressively dominate others.