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Silent But Deadly is an achievement in Halo 2 Vista and Halo: The Master Chief Collection. It can be obtained by killing 7 opponents from behind in a row without being spotted, on any level, any Difficulty.
The Halo 2 Vista achievement is worth 20 gamerscore and is represented by a 16-pointed star, a green fireball on the star, and the face of a ninja on the top.