Unlock All Levels:
At the main menu, press X, Triangle, Circle, Left, Up, Right, L2, R2.
While playing, press R2, L2, Up, Down, X, L3, Circle, X, Circle, X.
Kill Ghost in Traditions of the Trade:
Enter the hotel near the till, there are double doors. Go through these. There are some more double doors pick, the lock and go through. Equip your Fiber Wire. Go along until you see a ghost then quickly run up behind him and Fiber Wire it. You will kill the ghost and you will be able to drag it around the hotel.
(supplied by: Agent 47)