Elevator Operator is an Xbox One exclusive achievement in Outlast. To achieve it, the player must press the elevator button in the Administration Block. Seconds later, a screaming Murkoff employee will be seen plummeting to his death in the elevator shaft.
This is the only secret achievement that is not story-related in Outlast.
The achievement's descriptions reads "corpse", however, the person in question is shown to be alive before being dropped to his death.