Register a Capcom account at residentevil.net and link it to your game account. When you now enter the following case sensitive codes (without the quotes) at residentevil.net the corresponding in-game bonus will become unlocked. Note - some codes will expire and will require re-entering to continue the effect.
M92F Level 1 Slot 4 - Enter 'abyss'
G36 'Light Weight' Level 3 Slot 4 - Enter 'albert'
M92F 'Short Range' Level 1 Slot 3 - Enter 'beach'
Pale Rider Level 3 Slot 5 - Enter 'bioterrorism'
M92F 'Easy Grip' Level 3 Slot 4 - Enter 'dido'
P-90 Level 1 Slot 6 - Enter 'farfarello'
Windham Level 1 Slot 4 - Enter 'ghiozzo'
PC356 Level 1 Slot 6 - Enter 'globster'
M40A1 'Speed Load' Level 3 Slot 4 - Enter 'hell'
L. Hawk 'Short Range' Level 1 Slot 2 - Enter 'herb'
G36 'Speed Shot' Level 5 Slot 5 - Enter 'keith'
L. Hawk Level 1 Slot 3 - Enter 'lansdale'
L. Hawk 'Short Range' Level 5 Slot 4 - Enter 'mayday'
Muramasa Level 3 Slot 6 - Enter 'originaleleven'
M3 'Easy Grip' Level 1 Slot 3 - Enter 'promenade'
P-90 'Short Range+' Level 5 Slot 6 - Enter 'queen'
Windham 'Short Range' Level 1 Slot 3 - Enter 'raccoon'Drake Level 3 Slot 6 - Enter 'raymond'
Python Level 3 Slot 5 - Enter 'revelations'
Python 'Short Range+' Level 3 Slot 4 - Enter 'scagdead'
Python 'Speed Load' Level 5 Slot 5 - Enter 'unveiled'
High Roller 'Speed Load' Level 1 Slot 5 - Enter 'zombie'
Complete the following tasks to unlock the correspoding weapon.
PC356 Handgun - Defeat 150 enemies.
Hydra Shotgun - Complete the game under the Normal or higher difficulty setting.
Infinite Launcher - Complete the game in Hell mode.
Unlock Alternate Costumes
Below is a list of alternate costumes that become available when you complete the corresponding task.
Chris (BSAA Mission) - Reach player level 30.
Chris (Sailor) - Inflict 100,000 points of damage to an enemy in one hit in Raid mode.
Hunk (Umbrella) - Complete ALL stages under the Abyss difficulty with an 'S' rank.
Jessica (Arctic) - Complete ALL Raid mode stages under the Chasm difficulty.
Jessica (FBC) - Reach player level 40.
Jessica (Scuba) - Complete ALL Raid mode stages under the Trench difficulty.
Jill (BSAA Mission) - Obtain a super rare weapon.
Jill (Pirate) - Complete The Ghost Ship bonus stage.
Keith (Arctic) - Complete Campaign episodes 4 through 6.
Keith (Ninja) - Reach player level 50.
Keith (Office) - Complete ALL stages under the Chasm difficulty with an 'S' rank.
Morgan (Executive Suit) - Complete ALL stages under the Trench difficulty with an 'S' rank.
Norman (Veltro) - Complete ALL stages under the Abyss difficulty.
O'Brian (BSAA Coat) - Reach player level 20.
Parker (BSAA Mission) - Earn 10 bonuses in Raid mode.
Parker (FBC) - Defeat 10,000 enemies in Raid mode.
Quint (Arctic) - Reach player level 5.
Quint (Office) - Obtain all super rare weapons.
Rachael (FBC) - Earn a Trinity Bonus in Raid mode.
Raymond (FBC) - Reach player level 10.