Here's the most effortless way to achieve it:
First, you need to unlock Devil Trigger and build up a full bar (no need to upgrade it). Then go back to Mission 1. Once you arrive at the ride, get as close to it as you can and let the enemies come at you.
Then, activate Devil Trigger, which will automatically lift all enemies in the air and kill the ones caught by the ride. If some enemies didn't get caught, quickly deactivate Devil Trigger, let the survivors come at you an activate it again. If you run out of of energy, you can always kill the rest with rebellion (pressing B in default controls), like ZasterModa123 suggested.