Open all Levels 
Enter the following code at the main menu: 
X, Y, B, Left, Up, Right, L, R 

Dual Gold Desert Eagles 
Find second Key Card Reader Door, and open with Orthmeyer's Key Card, take 
Dual Desert Eagles on floor inside. 

Level skip with Silent Assassin rank and special weapons:
Press R, L, Up, Down, X, A , click Left-Analog stick, press B, A, B, A during game 
play when a level first starts. Note: Anytime in gameplay except training

Come back to Life 
When your health bar reaches zero the game will enter a black and white death 
sequence. If you are able to get four consecutive head shots on four different 
enemies during this sequence you will receive a small amount of health and return 
to the game. 

Bonus weapons:
Complete the indicated mission with a "Silent Assassin" rank to unlock weapons:

CZ 2000 Dual Pistols: Mission 1
Micro Uzi Dual Submachine Guns: Mission 2
Silverballer Silenced Dual Pistols: Mission 3
Magnum 500 Dual Pistols: Mission 4
Sawed-Off Shotgun Dual: Mission 5
M4 Carbine Silenced Assault Rifle: Mission 6
SG220 .S Dual Pistols: Mission 7
MP5 Silenced Submachine Gun: Mission 8
AK 74 Silenced Assault Rifle: Mission 9
GK 17 Dual Pistols: Mission 10
Micro Uzi Silenced Dual Submachine Guns: Mission 11
PGM Silenced Sniper Rifle: Mission 12 

Cheat and debug menus:
Note: This requires a modded Xbox. Copy the game to the hard drive then open 
the ini file in the main folder. There will be two lines commented out: 

//Debugging
//EnableCheats 

Remove the comment slashes and you will now be able access an in-game cheat 
menu by pressing L + Left Analog-stick Down. You can access the debug menu by 
pressing the L + R.

Unlock the Mini Gun:
The mini gun is held by a patient who is behind the locked doors of a basement 
room in Mission 1: Asylum Aftermath. The keycard that unlocks the doors can be 
found during Mission 9: The Wang Fou Incident. It is called Orthmeyer's Keycard 
and is on Lee Hong's desk in his office on the second floor of his mansion. After 
finding the card, finish the mission and save your progress. Quit to the main menu 
and replay the first mission. Head to the northern section of the map and turn right 
in the small room with the red flashing sensor on the ceiling. Pass through the west 
door and dispose of the patient in order to collect the mini gun.

Ghost:
In the level Traditions of the Trade, as soon as you enter the building if you go to 
the right of the staircase you will see a set of double doors. Go through them and 
pick the second set of double doors with a sign that says hotel wing closed. Once 
you do that go to room 106 or any of the other rooms around there closed off by 
police. Go into that room and walk into the bathroom then go into first person view 
and look in the mirror and you will see a ghost. 

Unlock the Tube:
Beat the Training with SA rating.

See Lee Hong:
In the level Asylum Aftermath, once you get the double Desert Eagles, keep going 
forward through the second set of doors until you get to the last tank with a body 
in it, then look to the right and there is a tank with Lee Hong written on it. 

Getting the M60 Early:
On the level "Deadly Cargo," it is possible to get the M60. If you don't get it here, 
you will have to wait until the 2nd to last level. Make your way to where the SWAT 
sniper is, on the building overlooking the ship. After the SWAT team attacks the 
ship, a helicopter will begin circling the area. If you shoot the gunner on the ship, 
he will fall to the ground with his M60. Make sure that you assassinate the target 
first and you kill the gunner while the helicopter is over a land area that you can 
reach. 

Reflection Ghost:
When playing The Meat King's Party look at the loading screen of the slaughter 
house. You should see a faint skull. This skull is also on the pinball machines in 
Rotterdam Rendezvous. 

Master Key:
In the level "Traditions of the Trade" when you are on the 3rd floor you will 
eventually see a vacuum boy. When he opens a door to vacuum the room, go to 
the door and pick up the master key. You should then have access to most doors.