Complete the indicated task to unlock the corresponding weapon.

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