Inspector
From Halopedia, the Halo wiki
Inspector
Inspector is an achievement in Halo: The Master Chief Collection. It is awarded for activating the fourth Halo 2: Anniversary Terminal on The Arbiter. The achievement is worth 5 Gamerscore and can be unlocked on any difficulty.
Location
The terminal can be found in the room bisected by two Forerunner gas canister conveyors, at the top of the ramp in the far right of the room.