Hard Boiled Difficulty:
If you complete the game on casual mode you will unlock Hard Boiled difficulty.
Extra Ammo:
If you run out ammunition but have enough Tequila Bomb for "Precision Aim", use it than aim at someone and shoot. This will create 20 to 30 more rounds for the handgun.
Secret Theater:
On the first level, after the second checkpoint when you are walking in the door take a right. You will see a damaged door. Shoot it and walk through. You will end up at a secret theater that shows two previews of games, The Wheelman and Blacksite Area 51. There is also a golden pistol, a paper crane, and a shotgun.
Complete the following to unlock Xbox Live Gamerscore points.
Hong Kong Marketplace Completed (10 points): Complete the Hong Kong Marketplace level on any Difficulty setting.The following multiplayer Achievements are also available:
Tai O Completed (10 points): Complete the Tai O level on any Difficulty setting.
The Mega Restaurant Completed (15 points): Complete The Mega Restaurant level on any Difficulty setting.
Zakarov's Penthouse Completed (15 points): Complete the Zakarov's Penthouse level on any Difficulty setting.
Master of Barrage (25 points): Kill 100 enemies with the Barrage special move.
Chicago History Museum Completed (20 points): Complete the Chicago History Museum level on any Difficulty setting.
Slums of Kowloon Completed (20 points): Complete the Slums of Kowloon level on any Difficulty setting.
Wong's Estate Completed (25 points): Complete the Wong's Estate level on any Difficulty setting.
Game Completed - Casual (40 points): Complete the entire game on the Casual Difficulty setting.
Game Completed - Normal (50 points): Complete the entire game on the Normal Difficulty setting.
Game Completed - Hard (60 points): Complete the entire game on the Hard Difficulty setting.
Game Completed - Hard Boiled (70 points): Complete the entire game on the Hard Boiled Difficulty setting.
I Don't Know How to Play Those (20 points): In The Mega Restaurant level, complete the Casino or the Restaurant without using the Guitar Cases.
Paleontologist (10 points): In the Chicago History Museum level, completely destroy the Brachiosaurus or the T-Rex.
Stay Dry (10 points): In the Slums of Kowloon level, stay along the top pathway in the crumbling sewer area.
Master of Precision Aim (25 points): Kill 50 enemies with the Precision Aim special move.
Master of Spin Attack (25 points): Kill 100 enemies with the Spin Attack Special Move.
Barrage Specialist (10 points): Use the Barrage special move with every weapon.
Old School (25 points): On any difficulty setting, complete a level without using any of the Tequila Bomb Special Moves.
Untouchable (10 points): On any difficulty setting, complete a Standoff by defeating all enemies without taking any damage.
Deadly World (25 points): Kill 50 enemies by using the environment instead of guns.
Rolling Death (25 points): Kill 50 enemies while riding on a roll cart.
Death by Swing (25 points): Kill 50 enemies while hanging from a chandelier.
The Killer (10 points): Fire 10,000 times.
Origami Master (35 points): Collect 250 Origami Cranes.
Chow Would Be Proud (15 points): Kill 10 enemies with a 5 star kill rating.
Ruthless (30 points): Perform a 50 star Style Combo.
Massive D (20 points): Cause at least $75,000,000 of damage.
Nobody Has That Much Style... (60 points): Acquire 5,000 total Style Points.
Meet John Woo (5 points): Visit the Unlock Shop.
Freedom! (10 points): Purchase all of the Multiplayer characters in the Unlock Shop.
It's All Mine... (30 points): Purchase every item in the Unlock Shop.
Tea Party (15 points): Host and complete 10 multiplayer matches on the Kowloon Teahouse map.
Jurassic Battle (15 points): Host and complete 10 multiplayer matches on the Dinosaur Rotunda map.
Mega Jackpot (15 points): Host and complete 10 multiplayer matches on the Golden Dragon Casino map.
Lounge Lizard (15 points): Host and complete 10 multiplayer matches on the Mega Lounge map.
Geronimo! (15 points): Host and complete 10 multiplayer matches on the Totem Pole Gallery map.
Sea Food (15 points): Host and complete 10 multiplayer matches on the Tai O Drug Labs map.
Movin' on Up (15 points): Host and complete 10 multiplayer matches on the Chicago Penthouse map.
One Gun To Rule Them All (10 points): Finish in 1st place in a Multiplayer ranked match.
Killing Spree (20 points): Get 5 kills in a row without dying in a Multiplayer ranked match.
Bullet Ballet (20 points): Kill 50 opponents while in Tequila Time in Multiplayer matches.
Winner Takes All (20 points): Kill 50 opponents using Tequila Bombs in Multiplayer matches.
Be the Master (20 points): Kill 100 opponents as John Woo in Multiplayer matches.
Explore the galaxy in the franchise's first open-world game.