Playing as baroness proceed to the wave survival at the big platform. I would advise not activating the turrets in case they kill the bosses by accident. Wave 1 is random robots. Wave 2 is robots plus lady jay, make sure you pursue her as she runs around and DO NOT kill the small stuff before finishing her. If you kill the all the regular mobs First Lady jay will vanish. Wave 3 scarlet and robots charge you, just slaughter her first and mop up for this achievement. It should pop as soon as scarlet dies. If it doesn’t, destro might have stolen your kill ;the jerk.