Gumshoe

Gumshoe is an Achievement in Halo 3: ODST and Halo: The Master Chief Collection. It is awarded for finding the 3rd clue in Campaign Mode; single-player or Co-op. It is worth 10 Gamerpoints.

Trivia

 * If you look behind the actual symbol, you can see the Marathon symbol imprinted in the background.
 * "Gumshoe" is a reference to to the first rubber soled "Sneakers" that were worn by Private Investigators to help them walk without being heard.