David and Goliath
David and Goliath is a Halo 4 achievement added with the Crimson Map Pack. It is awarded when the player boards an enemy-controlled Mantis. The achievement can only be unlocked on a Crimson map. Shatter is the only Crimson map which features Mantises.
On Matchmaking, Mantises are incredibly strong enemies. Needless to say, due to the Mantis' strong melee feature, one should always disable it with a Plasma Pistol's EMP overcharge. However, keep in mind that there are always other enemy team players who are on foot defending the Mantis. It is advised to approach the Mantis from its back while its operator is focusing on their enemies in front of them. While it is being distracted, disable it with EMP. Take note that some players would immediately leave the Mantis, while some others would remain inside. Sprint to its back and board it.
The name of the achievement is a reference to the biblical account of David and Goliath, which is included in the first Book of Samuel. The requirement of the achievement mirrors the account, in which David, a small young boy, defeated the giant Philistine warrior Goliath. In addition, the account originates from Book 1 of Samuel, chapter 17, which is most likely a reference to John-117's Spartan tag.