Needs More Whammy Bar

Needs More Whammy Bar is an achievement in Halo: The Master Chief Collection. It is unlocked by completing the level Regret with the Prophet Birthday Party skull active. The achievement is worth 5 gamerpoints and can be unlocked on any difficulty.

Trivia
The achievement's name is a reference to the fact that the Prophet Birthday Party skull causes each punch the player lands on Regret to be accompanied by an electric guitar lick.