The Dawn of the Rise of the Fallen Machines Add-on for Sunset Overdrive has 8 achievements worth 225 gamerscore.
Work with Buck and Sam to create a new weapon.
Weapons design is a tough business.
Survive Chaos Squad in the Robot Factory with at least 2300 Chaos.
Defeat Brandon. Like, for real.
Reroute the power inside the factory in the weirdest way possible.
Put on a robot costume and collect the kill codes.
Find Fiona and Lou, then help them escape by fixing Snackwrap.
Ride a cargo container into the factory.