Idle Hands is an achievement in Halo: The Master Chief Collection. It is awarded for activating the fourth Halo: Combat Evolved Anniversary Terminal on The Silent Cartographer. The achievement is worth 5 gamerpoints and can be unlocked on any difficulty.
The fourth terminal is located against the Marathon-symbol-shaped structure near the center of the island where the first Hunter pair is fought, on the circular part and beneath the "bridge".
The achievement's name is a reference to the phrase "idle hands are the Devil's playthings" and alludes to the terminal video, in which 343 Guilty Spark finds himself growing bored despite previous assurances that this was not possible.