OneShot: World Machine Edition

In the upper Refuge, go into the Apartment building to the top left from the Elevator Deck, in the hallway farthest in, go inside the 2nd room that has the light on. There will be a roomba on the ground, interact with it and you can tell Niko to ride it. You can make them ride around the whole room with it, when you go back to the door, Niko will get off, say it was fun, and the achievement will pop.