From Hell's Heart

From Hell's Heart is an achievement in Halo: Reach multiplayer matchmaking added with the Anniversary Map Pack. It is awarded for killing an enemy player that stuck you with a plasma grenade with their own grenade in a matchmade game.

Trivia
The achievement's name is a reference to the novel Moby-Dick. After stabbing his nemesis, the eponymous whale, with a harpoon, Captain Ahab yells, "...from hell's heart, I stab at thee!" He is then dragged underwater by the whale and drowns with it.