You can beat almost any mission very easily. In the missions where you have to destroy a helicopter pad or free some prisioners, you don't have to. Just go to the building you're supposed to raise your flag over, raise the flag, and you win.

In the level where you have to attack the Police Station, there is a billboard over a diner that has an advertising of Agent 47 for a clothing brand.

x-b-down-up-b-x this cheat is to get all the weapons in the game at the start with infinte ammo

Y, A, X, B, B, UP - shotgun
Y, A, X, B, B, LEFT - invisibility
Y, A, X, B, B, RIGHT - slow motion
Y, A, X, B, B, DOWN - fast motion
Y, A, X, B, A, UP - change spawn point
Y, A, X, B, A, RIGHT - infinite ammo
Y, A, X, B, A, DOWN - max charisma
Y, A, X, B, A, LEFT - nail gun
Y, A, X, B, Y, UP - sub machine gun
Y, A, X, B, Y, RIGHT - sniper rifle
Y, A, X, B, Y, LEFT- rocket launcher
Y, A, X, B, Y, DOWN - heavy machine gun
Y, A, X, B, X, UP - ragdolls

Beat game on You Got What It Takes? or Against All Odds difficulty.