I found it easiest to load up the multiplayer map "A Las Barricadas" on Easy, with as many hack tools as possible.
Head to the first objective point, and use the broken down white van to climb on the roof. Kill the KPA until you're instructed to retreat. Stay on the roof and trigger the next wave of enemies. A Wolverine will show up, hack it and get kills.
Keep going to rescue the Eagles, and hack the big vehicle and get a few more kills. Kill the remaining KPA and the next wave will bring another Wolverine, hack it and finish off the rest of the KPA.
Head to the last checkpoint and another 2 big vehicles will be there. Get the kills, and thethen finish or die and repeat.