Resident Evil 5 Cheats

Secret Trophies
Bad Blood: During the first fight with Wesker, damage him a set number of times.
War Hero: Complete all chapters on Professional.

Regenerate Items
Chapter 2-1, take all the items at the beginning and then Quit the game. Return to the game by selecting "Continue" and you will begin Chapter 2-1 with the items you got before you quit the game, however, the items at the beginning (you took just now) are still at the same place, so you can obtain them again. Repeat the same thing to get as many as you like. Note: This case happens in Chapter 3-1 too.

Clear Game Bonus
Alternate Costume: Beat the game once
Classic Horror Filter: Beat the game on Amateur difficulty
History of Resident Evil: Beat the game once
Infinity ammo: Beat the game once
Infinity Rocket Launcher: Beat Veteran Mode
Mercenaries: Beat the game once
New Game+: Beat The Game Once
Noise Filter: Beat the game on Veteran difficulty
Play as Sheva: Beat the game once
Professional mode: Beat game in Veteran mode
Retro Filter: Beat the game on Normal difficulty

DLC Trophies
Complete each condition to get the allotted Trophies. There are 7 Bronze Trophies and 3 Silver Trophies.

Army of One (Bronze): Win 30 matches in Slayers.
Bringing the Pain (Silver): Defeat 100 players using physical attacks in Versus.
Eye of the Tiger (Bronze): Win 30 matches in Survivors.
It Takes Two to Tango (Bronze): Chain a 40-defeated combo in Team Slayers.
It's All About the Points (Bronze): Score at least 40,000 points in Survivors.
Keep the Good Times Rolling (Bronze): Chain a 20-defeated combo in Slayers.
Let's Get This Party Started! (Bronze): Unlock all selectable characters in Versus.
The Team That Slays Together... (Silver): Win 30 matches in Team Slayers.
There's no "I" in Team (Bronze): Score at least 80,000 points in Team Survivors.
We Will Survive (Silver): Win 30 matches in Team Survivors.

Mercenaries Mode Characters
Stage-specific A ranks for new character unlocks (40,000+ points constitutes an A)

Chris (S.T.A.R.S.): Get an A rank on Experimental Facility
Chris (Safari): Get an A rank on Village
Jill (Battle Suit): Get an A rank on Ship Deck
Jill (BSAA): Get an A rank on Public Assembly
Sheva (Clubbin'): Get an A rank on Ancient Ruins
Sheva (Tribal): Get an A rank on Missile Area
Wesker (Midnight): Get an A rank on Mines
Wesker (S.T.A.R.S.): Get an A rank on Prison

Weapon Unlocks
Fully upgrading the first weapon of each type unlocks the ultimate weapon of each category.

Gatling Gun (Chris Only): Fully upgrade the VZ61 Machine Gun
Hydra Triple Barrel Shotgun: Fully upgrade the Ithaca M93 Shotgun
Longbow (Sheva Only): Fully upgrade the S75 Rifle
M93R Pistol (Samurai Edge Custom): Fully upgrade the M92F Pistol
S&W M500 (Handcannon): Fully upgrade the S&W M29 Magmum

Unlockable Home Items
Complete the following tasks to unlock Resident Evil 5 items in Home
Chris Redfield Ornament: Sign in to Home and you will automatically get it
Jill Valentine Ornament: Beat the game on veteran
Sheva Alomar Ornament: Beat the game on normal
Treasure Chest Ornament: Collect all treasures in the game
Wesker Ornament: Beat the game on professional

Glitches: Regenerate Items
Chapter 2-1, take all the items at the beginning and then Quit the game. Return to the game by selecting "Continue" and you will begin Chapter 2-1 with the items you got before you quit the game, however, the items at the beginning (you took just now) are still at the same place, so you can obtain them again. Repeat the same thing to get as many as you like.

Note: This works on any stage, this is just one example of how to benefit from it.

Unlockable Costumes for Campaign
Clubbin' Sheva: Beat the game
S.T.A.R.S. Chris: Shoot 25 BSAA emblems
Safari Chris: Beat the game
Tribal Sheva: Shoot 30 BSAA emblems

Unlock Infinity Rocket Launcher
To unlock the Rocket Launcher with infinite ammo, beat the game under 5 hours on any difficulty, and turn infinite ammo on under bonus features.

Unlockable Guns
Gatling Gun (Chris exclusive): Fully upgrade the VZ61 then buy the Gatling gun from the shop
Hydra: Fully upgrade the Ithaca M37 then buy the Hydra from the shop
Longbow (Sheva exclusive): Fully upgrade S75 then buy the longbow from the shop
M93R: Fully upgrade the M92F then buy the M93R from the shop
S&W M500 Magnum (HandCannon): Fully upgrade the S&W M29 Magnum then buy the S&W M500 from the shop

Unlimited Money and Ammo
Unlike in Resident Evil 4, your ammo and money carry over every time you replay a level. Collect money and ammo in a chapter; then pause, save and quit. Restart the chapter and you can collect everything a second time. This works well in chapters 1-2, 3-1 (the hovercraft level) and 4-1 (caves). As a general rule, this "farming" method works especially well in levels in which you can collect weapons worth money and ample hidden treasures like jewels and beetles. For instance, 3-1 has copious amounts of treasures, and a Rocket Launcher on the sunken boat that you can repeatedly collect.

Wesker's Dash Attack
When using the unlockable character Wesker in Mercenaries, you can click the Right Analog Stick (sometimes called R3) to initiate a dash. Press R1 + R2 while dashing to do a knee attack. Warning: This move will drain your own life meter, so use it sparingly!

Inventory Reload in Mercenaries Mode
In Mercenaries mode you can reload your weapon by pulling up your Inventory screen and combining the ammunition manually with the gun (using the "Move" command button). Once you get used to this, you can use it to your advantage since it is a lot faster then reloading your shotgun, for instance, on the fly. More importantly, you can use this trick while climbing a ladder or when you are a jumping down to really save some time -- and possibly your neck.

Discarding Weapons in Mercenaries Mode
In Mercenaries mode, ammunition drops are based on the type of weapons you have. Use this to your advantage by discarding weapons you don't use. This causes more ammunition to be dropped for other weapons. Example: For Wesker (Stars), drop the Samurai Edge to find more Magnum and Shotgun ammo.

Versus Mode: Unlockable Characters
These are the 8 unlockable characters for the DLC Versus Mode. While the same as Merceneries, they only have slightly different weapon-sets.

Chris(S.T.A.R.S): Unlock him through the Bonus Features menu at the cost of 13,000 Exchange Points
Chris(Safari): Unlock him through the Bonus Features menu at the cost of 8,000 Exchange Points
Jill(Battle Suit): Unlock her through the Bonus Features menu at the cost of 5,000 Exchange Points
Jill(BSAA): Unlock her through the Bonus Features menu at the cost of 5,000 Exchange Points
Sheva(Clubbin'): Unlock her through the Bonus Features menu at the cost of 6,000 Exchange Points
Sheva(Tribal): Unlock her through the Bonus Features menu at the cost of 15,000 Exchange Points
Wesker(Midnight): Unlock him through the Bonus Features menu at the cost of 5,000 Exchange Points
Wesker(S.T.A.R.S): Unlock him through the Bonus Features menu at the cost of 5,000 Exchange Points