Destroy 46 enemies (that number of kills will end the waves of monsters) in under 3 minutes without dying. This is a nightmare.
I made a lot of mistakes and still managed to pull it off. Be brisk, but don't go charging in.
*Stand on the barrel during the Sammy fight and you can hit him as he runs around. Be careful, though, because he can push you off of it.
*You can also stand on a post near the docks to avoid attacks and recover your health. You can hit enemies from there, but they'll seldom hit you.
*To one-shot the Searchers, either aim for their heads or strike when they're rearing up to hit you.
Voices and music were off because I was trying to do this for a week. Control sensitivity was 80.
This was earned on PS4's story mode, not chapter select. It can be done.
If anyone has questions, leave comments and I'll do my best to help you.