Successfully complete the indicated task to unlock the corresponding weapon.

Weapon	How to unlock
Chicago Typewriter	Successfully complete all four episodes.
Drill	Successfully complete all four episodes in Survival mode.
Infinite Bowgun	Successfully complete all four episodes.
Infinite Rocket Launcher	Successfully complete all four episodes with a combined time of less than S3 hours.
Meat Grinder	Successfully complete all four episodes in Survival mode.
Moira's Katana	Successfully complete all four episodes in Invisible mode.
Natalia's Bubble Gun	Successfully complete all four episodes in Countdown mode.
Short Sword	Successfully complete all four episodes in Normal mode.