Jedi Knight 2: Jedi Outcast Cheats (Xbox)

Go to the Cheat menu under Extras and put in the
  code BISCUIT

Enter "DEMO" as a code at the cheats screen under the "Extras" menu to unlock the
Alzoc III level. Alternately, successfully complete the game on any difficulty setting,
then go to "Extras" and enter the level selection screen. The Mission To Alzoc III level
will appear all the way at the bottom. Note: Your Force powers will not be at their
maximum strength.

Use Force Speed to move faster, then attack him with as many blows as possible.

Hide behind one of the pillars in the four corners of the floor. Desan will throw his
lightsaber at you, but it will cut through the rock pillars and will fall on him, killing
him instantly. Note: Use the invincibility beam in the center of the room first so
his saber does not hit you.

Select Mind Trick for your Force weapon. When he shoots his lightsaber, block it away
to the ground. Use the Jedi Mind Trick and attack him. He will be vulnerable for about
five seconds.

Enter "FUDGE" as a code at the cheats screen under the "Extras" menu.

The following trick allows you to walk on walls using a little bit of Force power for
short amount of time. Go up to a wall. If the wall is to your right, press Left
Analog-stick Up/Right and press A. You should walk on the wall. If the wall is to your
left, Left Analog-stick Up/Left and press A.

If you have Saber Defense to the top in Force powers, it is easier to kill enemies with
lightsabers. Defend their blows and sometimes they will get hit and get killed.

When you get to the harder levels, you will find out that Dessan (Dark Jedi) had
followed you to the Valley of the Jedi and was giving his fighters the power of the Force
and created fake Jedi. You will have to fight these people throughout the game. If you do
not want to waste your time fighting them, then use Force Speed. You will move incredibly
faster than your opponent and can attack them while his lightsaber is going too slow.

After you get Force Grip, use it and Saber Throw to kill the "fake" Jedis. This take
longer as you progress in the game, but it still works. To kill opponents faster, change
your lightsaber mode to red (strong).

To enable 99 stat points while utilizing the multi-player function, pan the character
screen and select Beedo. Scroll down and equip the yellow light saber, and initiate the
Jedi Master rank. This causes a significant increase in stat point selection.

Code - Result

CHERRY - Unlock 7 Single Player Levels 

FLICKY - Unlock All Movies 

BISCUIT - Infinite Ammo 

BUBBLE - Infinite Health 

FUDGE - Unlock Lightsaber 

PEEPS - Unlock MP characters

When you jump to get to the other end of a moving reactor and face the Reborn Jedi, when
he is close to either end of the moving things Force Push him or slash him into it. Then,
watch him evaporate out of thin air.

Go to the Cheat menu under Extras and put in the
  code FUDGE

Enter "CHERRY" as a code at the cheats screen under the "Extras" menu to unlock the
first seven levels.

Go to the Cheat menu under Extras and put in the
  code CHERRY

Enter "SCOOTER" as a code at the cheats screen under the "Extras" menu.

Go to the Cheat menu under Extras and put in the
  code BUBBLE

Go to the Cheat menu under Extras and put in the
  code PEEPS

Strafe left or right (recommended) and keep pressing an attack. Kyle should swing his
lightsaber to the right and his left hand should release his lightsaber.

Go to the Cheat menu under Extras and put in the
  code DEMO

Go to the Cheat menu under Extras and put in the
  code FLICKY to unlock all FMV's

Enter "PEEPS" as a code at the cheats screen under the "Extras" menu to unlock all
multi-player characters.

To get through the blast door, activate the defense guns. After killing the Storm
Troopers, get on the defense guns and shoot the blast door with the alternate attack.
Note: The defense guns are activated upstairs and can only be accessed with the key an
officer has.