Quake 4 - Platform: Xbox 360

Invincibility:
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While playing the game, press Back to display the objectives window, then 
quickly press Down, Up, Down(2), Up, Right, Left, Right, Y, X(2), A. Your health 
will still decrease, but will never reach zero. 

Get all:
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While playing the game, press Back to display the objectives window, then 
quickly press Up(2), Down(2), Left, Right, Left, Right, B, A. 

Full health:
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While playing the game, press Back to display the objectives window, then 
quickly press B, A, B, A, Up(2), Down, X. 

Full ammo for all weapons:
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While playing the game, press Back to display the objectives window, then 
quickly press B, A, X, Y, Left, Right, Left. 

Single Player ranks and awards:
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Complete the indicated tasks to unlock the corresponding rank or award in Single 
Player mode:

Ballistics Expert: Complete a level using only the rocket launcher. 
Blaster Master: Complete a level using only the blaster. 
Blazing Buckshot: Complete a level using only the shotgun. 
Corporal (Act 1 ): Complete Act 1 with the rank of Corporal. 
Corporal (Act 2 ): Complete Acts 1 and 2 with the rank of Corporal. 
Corporal (Defeated The Strogg ): Complete the game with the rank of Corporal. 
Enlightening: Complete a level using only the lightning gun. 
Full Arsenal: Complete a level where a shot with every weapon hits. 
Galactic Order of Heroism: Fight alongside Raven Squad. 
General (Act 1 ): Complete Act 1 with the rank of General. 
General (Act 2 ): Complete Acts 1 and 2 with the rank of General. 
General (Defeated The Strogg ): Complete the game with the rank of General. 
Hyperactive: Complete a level using only the hyperblaster. 
Lieutenant (Act 1 ): Complete Act 1 with the rank of Lieutenant. 
Lieutenant (Act 2 ): Complete Acts 1 and 2 with the rank of Lieutenant. 
Lieutenant (Defeated The Strogg ): Complete Acts 1 and 2 with the rank of 
Lieutenant. 
Pineapple King: Complete a level using only the grenade launcher. 
Private (Act 1 ): Complete Act 1 with the rank of Private. 
Private (Act 2 ): Complete Acts 1 and 2 with the rank of Private. 
Private (Defeated the Strogg ): Complete the game with the rank of Private. 
Solar Star of Courage: Fight alongside Viper Squad (Hangar2). 
Sky Marshall's Medal of Valor: Rescuing Pvt. Lanier of Eagle Squad (Waste). 
The Machine: Complete a level using only the machine gun. 
Tooth and Nail: Complete a level using only the nailgun. 
The Dark Lord: Complete a level using only the DMG. 
The Sniper: Complete a level using only the railgun. 
Untouchable: Complete a level without taking damage. 

Points:
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You need four people, two on each team for this trick. Set the game 
to Arena CTF Endurance. The person who wants the points must score 
nine flags and achieve an in-game score of 101. Then, have his 
partner kill himself 100 times. Once this is done, the person who 
wanted the points will have 3,300 points. Let the timer run out and 
the points will register. Note: Do not score the last flag or the 
points will reset.