You can find the guy in the Low Area section. Go all the way to the left. He is standing next to the yellow arrow lights. I believe you have to beat his highscore of the stealth minigame in order to get the orb. So I suggest you get atleast 105 points in order to unlock the achievement!
Carrying the bomb that Miyu gave you will lock your sprinting ability, but will double the points for the stealth minigame.
Going for the highscore will also net you this achievement:
Might aswell get caught first to also get:
And last but not least, speak to the manager: