Activating this trainer:

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:

NumPad5: Freeze Details Timer

Trainer Options:

NumPad1: Unlimited Health
NumPad2: Unlimited Heat Power Gauge
NumPad3: Empty Stomach (Modifiable)
NumPad4: Consuming Item Gives Max
NumPad5: Freeze Details Timer
NumPad6: Unlimited Durability / Ammo / Throwables
NumPad7: Super Damage
NumPad8: Stop Friendly Bleeding Out Missions
NumPad9: Game Speed

Editor Options:

Currency: Player Money
Player Progression: Red XP
Player Progression: Blue XP
Player Progression: Yellow XP
Player Progression: Green XP
Player Progression: Purple XP

Notes:

For EDITOR OPTIONS

For currency and XP points, enter the menu where you can see them, then the values fill in.  Modify them and press TAB to change them.  Colors of XP are used to unlock skills.

Unlimited Health:
Toggle on and when you take damage, your health fills.

Unlimited Heat Power Gauge:
Toggle on and the gauge remains full.

Empty Stomach (Modifiable):
Toggle on and your stomach remains locked at zero or the modified value.

Consuming Item Gives Max:
When you eat or drink or take pills, you will have max of the item instead of it depleting.

Freeze Details Timer:
There is a timer that shows during certain events for details.  Toggle on to freeze it.

Unlimited Durability / Ammo / Throwables:
Toggle on and most throwables, weapons, guns, knives, etc. will have unlimited use.  Some items, the value is only modified when you equip from the inventory while in combat.

Super Damage:
Toggle on and most enemies are killed in 1 or 2 hits.

Stop Friendly Bleeding Out Missions:
Some missions there is friendies who can die by bleeding out.  Toggle on to try and stop that.

Game Speed:
Toggle on to speed up the game.