Machines vs. MachinesPlaythrough/Route: 2/B
Quest: N/A
Your second playthrough allows you to play as 9S. By pressing triangle, you're able to hack enemies. If you hack an enemy while they are unaware of you, you'll be given the option to either detonate, subjugate, or remote control them.
Once you're in control of a machine, just kill 50 other machines.
*** Spoiler - click to reveal ***Alternatively, after finishing your third playthrough/route C, you'll be able to purchase this trophy from the Strange Resistance Woman (wearing a machine mask) inside of the Resistance Camp for 100,000G.