Just Peachy! is an achievement in Plants vs. Zombies: Garden Warfare 2. To obtain this achievement, the player must stun 50 Z-Mechs with the Citron's EMPeach ability.
You could go in the Backyard Battleground, have a friend go in a Z-Mech, then constantly stun them by going in the booth. This is done easier in the Crazy Targets Range, as alarms will not trigger.