Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Infinite Health
NumPad2: One Hit Kills
NumPad3: Infinite Durability
NumPad4: Unlimited Ammo
NumPad5: Quick Kill Is Always Enabled
Quick Kill Is Always Enabled: If One Hit Kills bores you and/or you enjoy all the different killing animations, use this option. While active you can always perform the quick kill by pressing F if enemy is close to you.
Unlock more trainer options including updates from here - Redeemer Trainer