Resident Evil: The Umbrella Chronicles Cheats & Tips

Shoot enemies on the top of the head for a critical hit.

with all the leeches find the biggest group throw a grenade this got me about 50 kills per time

Beginnings 1
Beat Train Derailment 3
Beginnings 2
Beat Beginnings 1 with an A rank or higher
Rebirth 1
Beat Mansion Incident 3
Rebirth 2
Beat Rebirth 1

get out your shotgun, to be safe, and wait for a zombie to bite you [if not shoot it or use knife]. Counter attack it: it gets straight kills.

Entry Location:
Loading Screen

If you shoot the symbol for Umbrella enough, it will make a sound.

To unlockk extra sub-scenarios you need to complete certain scenarios with a certain rank.

Dark Legacy 1 Complete Fall Of Umbrella 3
Dark Legacy 2 Complete Death's Door
Death's Door Complete Racoons Destruction 3 with an S or A ranking
Fourth Survivor Complete Dark Legacy 2
Nightmare 1 Complete Mansion Incident 1
Nightmare 2 Complete Nightmare 1 with an S or A ranking

Entry Location:
To unlock items from past Resident Evil games you need to get an "A" or "S" rank in the following senarios

Battery
Complete Dark Legacy 2 with "S" rank
Blue/Green Leech Charm
Complete Train Derailment 3 with "A" rank
Blue/Red/Green Chemical
Complete Umbrella's End 2 with "A" rank
Blue/Red/Yellow Gemstone
Complete Rebirth 2 with "A" rank
Book of Wisdom/Future Compass
Complete Raccoon's Destruction 1 with "S" rank
Briefcase
Complete Train Derailment 1 with "S" rank
Chronos Key
Complete Raccoon's Destruction 3 with "S" rank
Clark/Gail X-Ray
Complete Rebirth 1 with "A" rank
Crystal/Obsidian/Amber Ball
Complete Raccoon's Destruction 3 with "A" rank
Cylinder Shaft
Complete Nightmare 1 with "A" rank
Death Mask
Complete Rebirth 2 with "S" rank
Eagle/Serpent/Jaguar Stone
Complete Fourth Survivor with "S" rank
Emblem/Gold Emblem
Complete Nightmare 2 with "S" rank
Film A/B/C/D
Complete Umbrella's End 1 with "S" rank
Fire/Water Key
Complete Beginning 2 with "A" rank
Fuel Canteen
Complete Mansion Incident 3 with "S" rank
G-Virus
Complete Fourth Survivor with "A" rank
Hex Crank
Complete Nightmare 1 with "S" rank
Ink Ribbon
Complete Umbrella's End 3 with "S" rank
Joint N/S Plug
Complete Raccoon's Destruction 2 with "A" rank
King/Knight/Bishop/Rook Plug
Complete Dark Legacy 1 with "A" rank
Last Book, Vol. 1/2
Complete Nightmare 2 with "A" rank
Lighter Fluid
Complete Raccoon's Destruction 2 with "S" rank
Medium Base
Complete Dark Legacy 1 with "S" rank
Microfilm A/B
Complete Beginning 2 with "S" rank
Mixing Set
Complete Train Derailment 1 with "A" rank
MO Disk
Complete Mansion Incident 3 with "A" rank
Motherboard
Complete Beginning 1 with "A" rank
Picture (Ada and John)
Complete Death's Door with "A" rank
Plastic Bomb/Detonator
Complete Umbrella's End 1 with "A" rank
Relief of Discipline/Obedience/Unity
Complete Train Derailment 2 with "S" rank
S.T.A.R.S. Card (Brad's)
Complete Death's Door with "S" rank
S.T.A.R.S. Card (Jill's)
Complete Raccoon's Destruction 1 with "A" rank
Slide Cartridge
Complete Rebirth 1 with "S" rank
Spade/Diamond/Club/Heart Key
Complete Dark Legacy 2 with "A" rank
Square Crank
Complete Umbrella's End 2 with "S" rank
Statue of Good/Evil
Complete Train Derailment 2 with "A" rank
Sterilizing Agent
Complete Train Derailment 3 with "S" rank
Sun/Star/Moon Crest
Complete Mansion Incident 2 with "A" rank
V-Jolt
Complete Mansion Incident 2 with "S" rank
Vaccine
Complete Umbrella's End 3 with "A" rank
Valve Handle
Complete Beginning 1 with "S" rank

You must complete all Hard mode missions with an S ranking. Once you have done this, the option to upgrade your weapons to level 5 becomes available. This gives your guns unlimited ammunition.

shoot a zombie 1ns with a shotgun and you should have infinite health

To unlock Cooperative mode in all missions, including the sub-missions (Wesker's missions), simply complete "The Fourth Survivor" sub-mission on any difficulty. An option will appear on the right when selecting characters that looks like two pistols and says "begin play with 2 players". Both players play as the same character, there are just two aiming reticles on the screen to play with.