Enabling cheats in Hitman: Blood Money for the PC involves editing a game file, therefore it is recommended that you make a backup of any file which is to be edited before applying the changes. This way, if something goes screwy, you can just replace the old file.
How to Enable Cheats in Hitman: Blood Money
Using a text editor, add the following line to the hitmanbloodmoney.inifile located in the game folder.
Using the Cheats
Once the file edit has been made, begin or continue a game within Hitman: Blood Money.
While playing, press C to display the cheat menu. You can now select the cheats here. Press up or down to select the cheat, and press left or right to toggle the options for it. Setting it to 0 will disable the cheat and setting it to 1 will enable the cheat.
Here are the cheat options:
Toggle on screen display.
Toggle God mode.
Show Enemy Vision
Unlimited ammunition in current clip.
Cycle through disguises in current level.
All objectives completed in current level.
Note: once cheats have been activated you can also press Shift + C to complete a level instantly.
Speed up time; "10" is highest value.
Teleport through level's waypoints.
Teleport to pointer location.
Game version note: If you have installed the version 1.2 patch (or above if future patches become available) the EnableCheats edit in the .ini file will not activate cheats within the game.
If you have version 1.2 installed and would like to use a memory hack to enable some of the cheats Dustywrc from the BF2 Battle Coders forum has made one. More information and the download is available here.
Also, ZIOD from the Eidos Interactive Forums has a cheat enabler which will allow you to use the above listed cheats, more information on the cheat enabler can be found here.