There are a total of 7 unique vehicles in Watch Dogs 2, and using any of them will unlock this. The easiest to find is the Rainbow Missile and can be attained early in the game. Head to the following location on the map:
Once here, you'll need to make your way into the backyard of the house, shut off the ctOS system, grab the scooter, open the door and drive out. The vehicle will be added to your
Car On Demand app as well.
Solution by
Maka91