Be Like Marty

Be Like Marty is an achievement in Halo 3: ODST. It is awarded for finishing an entire round on Firefight without killing an enemy. It is worth 10 Gamerpoints.

Trivia
The name of the achievement is very likely a reference to Martin "Marty" O'Donnell, the musical composer for the original Halo trilogy and Halo 3: ODST. This achievement was confirmed in a comment in the 7/7/09 Bungie Podcast, presumably along with the rest of the leaked list.