.40 cal Submachine Gun Beat the Gnucci Estate level
.50 cal Semi-automatic Pistol Beat the Igor Baltiysky level
5.56mm Assault Rifle Beat the Central Zoo level
5.7mm Submachine Gun Beat the Fisk Industries level
7.62mm Assault Rifle Beat the Pier 74 level
Anti-tank Weapon Beat the Pier 74 Revisted level
Auto Shotgun Beat the Takagi Building level
Battle Rifle Beat the Stark Towers level
Flame Thrower Beat the Igor Baltiysky level
Grenade Launcher Beat the Pier 74 level
Hand Cannon Beat the Gnucci Estate level
Machine Gun Beat the Grey's Funeral Home level
Machine Pistol .45 cal Beat the Chop Shop Level
Machine Pistol 5.56mm Beat the Grey's Funeral Home level
Revolver Beat the Lucky's Bar level
Sniper Rifle Beat the Grand Nixon Island level

Alternate cheat mode:  Create a new profile with V PIRATE as a case-sensitive name, including the space. All missions, challenge modes, punishment modes, armory, war journal stuff, comic covers, concept art, flashbacks, movies, skins and cheats will be unlocked.

Unlock Comic covers:  Complete challenge and punishment modes to unlock all comic covers.

Funeral home:  When you reach the funeral home level, do not jump up and just shoot everyone. If you get out of the casket and do a quick kill on everyone in the room, you will earn a lot more points. You should keep one of them alive to use as a human
shield. None of them have guns in that room.

Special kills:  When you grab enemies with skulls over their heads, you can get information from them. In order to do special kills, you must walk over to a purple skull shining out of the ground with the enemy. To do this, you must grab him and take him over to the purple skull. Then, use his own method.

Get points easy:  To achieve a high score, grab a human shield and use him. Shoot some enemies and try not to get hit. The longer you go without getting hit, the higher your points get. However, if you somehow get hit your points are rounded up and you must start again with not getting hit.

Russian on the island  -  When you get off of the gondola, take a right into the shed. Do not go to the launch pad yet. Get the ammunition for the sniper rifle. Leave the shed and make a right to the steps to the missile launch pad. Walk up the steps and the Russian will say "We have to stop meeting like this, Big Boy!". He will stay on the catwalk above, throwing flaming barrels at you. Shooting him is useless. Watch the Russian through your more precise aiming (it is easier this way). When he lifts a barrel, he will walk a little way, lift it above his head, and it will catch fire. Shoot the barrel while it is on fire before he throws it at you. It will explode in his face. After two or three explosions, guards will begin to appear from the right and left sides of the map. Take them out if they give you a problem, however try to focus on the Russian. After the Russian's life gets half-way down, an intermission sequence featuring him catching ablaze will play. He will then jump down and chase after you. Get him to chase you into the piles of barrels scattered in the corners of the map. There is one barrel in each pile that will light (usually the brightest one). Get the Russian to walk into the barrel and it will ignite. Then, shoot the barrel to blow it up on the Russian. Be careful not to get too close or you will sustain damage. After about four to five explosions, he will be defeated. Note: If the Russian runs into a guard, the guard will also catch fire.