Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

Numpad 1: Unlimited Health
Numpad 2: Unlimited Focus/Adrenaline
Numpad 3: No Reload
Numpad 4: Unlimited Grenades
Numpad 5: No Heat Generated
Numpad 6: Fast Cooldowns
Numpad 7: Easy Kills
Numpad 8: No Suppression
Numpad 9: End Mission Credits

Notes:

Numpad 1: Unlimited Health - toggle on and your have unlimited health.

Numpad 2: Unlimited Focus/Adrenaline - toggle on and your skills meter attempts to remain full.  For some skills, it's best to leave this off until you need focus, then toggle on, then toggle back off once it is full.

Numpad 3: No Reload - toggle on and many weapons that have ammo are unlimited.

Numpad 4: Unlimited Grenades - toggle off and grenades and possibly other throwable objects are unlimited.

Numpad 5: No Heat Generated - toggle on and items that generate heat do not generate heat in most circumstances.

Numpad 6: Fast Cooldowns - toggle on and many skills cooldown more quickly to be able to be used again.

Numpad 7: Easy Kills - toggle on and many lower creatures will die quickly when attacked.  May not work on all creatures or boss creatures.

Numpad 8: No Suppression - toggle this on and even if your suppression gauge is depleted and you would normally be overwhelmed, you can still move and attack.  You are immune to being suppressed.

Numpad 9: End Mission Credits - toggle this on during the mission and leave it on.  When you pick up some credits that are dropped during the mission, you will have that amount of credits added at the end of the mission.  Alternately, you can turn it on, collect credits once, then turn it off and you will have the amount shown in the trainer, plus any more credits you pick up.