The Shield Lemonhead bonus level
At the final mission, where Vic and Shane are in the hotel room with Hagop, when they give three options (to either kill or arrest Hagop, or take his bribe). Kill him. Assuming that there are no other conditions, after a few intermission sequences, Lemonhead will be featured in a new cutscene wanting back in. This will lead to a new, but short level featuring the Strike Team (Shane Vendrell, Ronnie Gardocki, and Curtis Lemansky a.k.a. Lemonhead).
Bonuses
Successfully complete the indicated task to unlock the corresponding bonus:
Bonus 1: Successfully complete the optional objective to take the suspect to Claudette’s desk after talking to Julien on your second visit to the Barn.
Bonus 2: Successfully complete the optional objective to find Carl’s hidden stash on the pile of clothes in the corner of his bedroom on your first visit to Carl’s apartment.
Bonus 3: Successfully complete the optional objective to return the runaway suspect to Danny when you visit Lago apartments after arresting Ruben Diaz.
Bonus 4: Successfully complete the optional objective to arrest the two drug dealers after unlocking Bonus 3.
Bonus 5: Successfully complete the optional objective of escorting Jed to Danny after interrogating him to find out where Antwon Watts is found.
Bonus 6: Successfully complete the optional objective to arrest the three punks robbing Jed’s apartment after unlocking Bonus 5.
Bonus 7: Successfully complete the optional objective to find the stolen police issued shotgun while searching the tenement building.
Bonus 8: Successfully complete the optional objective to find six crack cocaine stashes while searching the tenement building.
Bonus 9: Successfully complete the optional objective to recover surveillance tape from Stone’s pawn shop.
Bonus 10: Successfully complete the optional objective to find four pieces of additional evidence against the Armenian Might while searching the room containing the MP5s.
Bonus 11: Successfully complete the optional objective to rescue the hostage while searching the Sierra Hotel for Hagop.
Bonus 12: Take the bribe from Hagop at end of the game.
Bonus 13: Arrest Hagop at the end of the game.
Bonus 14: Kill Hagop at the end of the game.
Bonus 15: Arrest a large number of suspects on the Normal or Hard difficulty setting.
Bonus 16: Unknown.
Bonus 17: When in the tenement building, beat up the unarmed junkie found after the crawlspace using only your fists on the Normal or Hard difficulty setting.
Bonus 18: Keep putting coins into the machines found at Harry Palm’s porn shop on the Hard difficulty setting. Note: This may not work during your first visit.
Bonus 19: Successfully search a large number of possible contraband hiding places (cupboards, drawers, etc.) on the Normal or Hard difficulty setting.
Bonus 20: Successfully search a large number of suspects (alive or dead) on the Normal or Hard difficulty setting.
Bonuses 21 and 22: Successfully complete the game on the Hard difficulty setting.
Bonuses 23, 24, and 25: Successfully complete the game.