Cowardly Grunt Achievement in Halo: The Master Chief Collection

This Easter Egg can be found in the mission, Uprising.

The Cowardly Grunt is a unique dialogue enemy that can only be found in the aforementioned mission. After clearing out the first large room after the main cavern, you can find this Grunt cowering in fear next to two other dead Grunts. Upon approaching the Grunt, he’ll bark, "Please, no hurt! Me like Elites. Brutes stinky bad bad. Me stay here, make sure no Brutes come behind mighty Arbiter. Heh, heh... Eh?" Take note however that this line of dialogue will only work once all the Brutes in this room are dead. After the Grunt has finished talking, the achievement will unlock.