Chief, Smash! is an achievement in Halo 4. It is awarded for killing three Promethean Crawlers in one hit with the Gravity Hammer on the eighth campaign level, Midnight. The achievement is worth 20 Gamerpoints. It is represented by the Gravity Hammer.
- The achievement's title is a reference to Marvel Comics' Hulk, who is famous for screaming "Hulk smash!" when enraged or preparing to attack his foes.
- In the Prima Official Guide, the achievement is titled "Whack A Mole" and the description reads "In Mission 9, kill 5 Crawlers with one hit of the gravity hammer". The Halo Waypoint web and mobile app also incorrectly lists the achievement as "Whack A Mole", but provides the correct description.