Once the last one has been collected, you'll complete the mission, and unlock four others, which you can play in any order you please. It's fairly straightforward, though a tricky one is the fifth, which can be collected at speed with a leap after a wall run - though if you mess it up, a stationary quick turn jump should give you enough time. This has you collect a series of special Gridleaks in the open world, going from one to the next within a short space of time. After speaking with Plastic, head to the way point to start the mission proper.
