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UNLOCKABLESEARN THE CHEATS
Yes, you actually have to earn the right to use the cheat codes! Here's how:
-    Bulletproof Lara - Complete England in less than 27:00
-    Draw Enemy Health- Complete Bolivia in less than 12:30
-    Infinite Assault Rifle Ammo - Complete Japan in less than 12:15
-    Infinite Grenade Launcher ammo -Complete Kazakhstan in less than 27:10

-    Infinite Shotgun ammo - Complete Ghana in less than 20:00
-    Infinite SMG ammo - Complete Peru in less than 21:30
-    One Shot kill - Complete Bolivia Redux in less than 4:15
-    Wield Excalibur - Complete Nepal in less than 13:40
-    Wield Soul Reaver - Complete Game and all time trials
USE THE CHEATS
Here's what you have to enter (in-game) if you want to use the unlockable codes (see above):
-    Hold Backspace and press 7 -Bulletproof Lara
-    Hold Backspace and press 3 - Infinite Assault Rifle Ammo
-    Hold Backspace and press 4 - Infinite Grenade Launcher Ammo
-    Hold Backspace and press 5 - Infinite Shotgun Ammo
-    Hold Backspace and press 6 - Infinite SMG Ammo
-    Hold Backspace and press 8 - One Shot Kill
-    Hold Backspace and press 2 - Show Enemy Health
-    Hold Backspace and press 1 -Textureless Mode
-    Hold Backspace and press 9 - Wield Excalibur
-    Hold Backspace and press 0 - Wield Soul Reaver