This is a fairly easy achievement requiring you to find a hidden photo of the developers for QUBE. Load up sector 6 and follow the first bit of the level which is mostly narrative until you come across a room with a blue electrical wire running through it. Head to the right of the room and jump on the block in the corner, continue jumping along the narrow wall until you reach the big slanted ramp area. Walk up it until you reach a staircase, walk down it and there's the picture. You may also need to interact with the picture for it to unlock.