Hold L1, then press X, R1, Triangle, R1, Square, L2. Bulletproof.
Hold L1, then press Square, O, X, L2, R1, Triangle Gives the ability to drain enemy health.
Press and hold L2, then press CROSS,CIRCLE,CROSS,L1,SQUARE,TRIANGLE. Infinite assault rifle ammo.
Hold L2, then press L1, Triangle, R1, Circle, L1, Square. Infinite Grenade Launcher Ammo.
Hold L2, then press R1, Circle, Square, L1, Square, X. Infinite Shotgun Ammo.
Hold L2, then press Circle, Triangle, L1, R1, X, Circle. Infinite SMG Ammo.
Press and hold L1, then press TRIANGLE,CROSS,TRIANGLE,SQUARE,L2,CIRCLE. One shot kill.
Press and hold L1,then press L2,CROSS,CIRCLE,CROSS,TRIANGLE,R1. Textureless Mode.
Hold L2 and press Triangle, X, O R1, Triangle, L1 Wield Excalibur
To use: Press and hold L2. Then press: X-R1-O-R1-L1-[]. Wield Soul Reaver.

Unlockables

Object Model  -  Get all the silver artifacts from the stage

Bolivia - 100% of the object models get all silver artifacts in Bolivia

England - 100% of the object models get all silver artifacts in England

Japan - 100% of the object models get all silver artifacts in Japan

Kazakhstan - 100% of the object models get all silver artifacts in Kazakhstan

Nepal - 100% of the object models get all silver artifacts in Nepal

Peru - 100% of the object models get all silver artifacts in Peru

Special - 100% of the object models get all silver atifacts in croft manor

West Africa - 100% of the object models get all silver artifacts in West Africa

Outfits

Amanda Beat the time trial in West Africa
Amanda, Winter Beat the game getting all secrets and beat all time trials

Biker Outfit Complete England level
Biker, No Jacket Collect all silver and gold rewards in England
Biker, Red Jacket Collect all silver rewards in England
Bikini (Black with design) Complete the main story, all time trials, and collect every atrifact (including Croft Manor)
Bikini, White Complete the game and beat all Time Trials

Cat Suit Find the Gold Artefact in the Japan level
Classic outfit Get the gold secret in Peru
Classic, Grey Find the Gold Artefact in the West Africa Level

Evening, Red Find all Silver Artefacts in the Japan Level
Evening, Ripped Complete Japan level

Goth, Lace Shirt Beat the time trial in Japan
Gothic outfit Complete the England Time Trial
Green Sport outfit Complete the Bolivia Time Trial

Legend, Black Collect all silver rewards in Croft Manor
Legend, Blue Collect all silver rewards in Peru
Legend, Pink Collect all silver rewards in Ghana
Legend, Union Jack Collect all silver rewards in Bolivia

Snowsuit Collect the gold rewards from Nepal
Snowsuit Get the gold artifact in Nepal
Special Forces outfit Collect the Gold Artifact from England
Sport Suit Get the gold reward on the 1st level
Sport, Green Complete the Bolivia time trial
Suit Outfit Find the Gold Artifact in Croft Mansion
Suit, Cream Collect all silver and gold rewards in Croft Manor
Swimsuit 100% completion

Winter Complete the Kazahkstan level
Winter Pink, No coat Complete the Peru time trial
Winter, Pink Beat time trial in Nepal
Winter, Pink No Coat outfit Beat the time trial in Peru

Pistol Upgrades  -  Gain a certain amount of bonus rewards to unlock various pistol upgrades

Increased Accuracy 50% of silver and bronze rewards
Increased Damage 75% of silver and bronze rewards
Increased Magazine Capacity 25% of silver and bronze rewards

Unlockable Cheats  -  Cheats appear in the Specials menu and the buttons are respective to your version of Tomb Raider Legend. Cheats are only unlocked when you clear the game or meet the following criteria.

Bulletproof Lara clear England under 27:00 in Time Trials.
Infinite grenade launcher Clear Kazakhstan under 27:10 in Time Trials.
Infinite MG415 Ammo Clear Peru under 21:30 in Time Trials.
Infinite RC650 Ammo Clear Japan under 12:15 in Time Trials.
Infinite shotgun Ammo Clear Ghana under 20:00 in Time Trials.
One hit deaths Clear Bolivia (stage 8) under 4:15 in Time Trials.
Show enemy health Clear Bolivia under 12:30 in Time Trials.
Textureless Cheat Clear the game (any difficulty).
Unlock Excalibur Clear Nepal under 13:40 in Time Trials.
Unlock the Soul Reaver Clear the game and complete all time trials.

Unlockable Character Profiles

Alister Fletcher Collect 90% of all Bronze rewards
Amanda Evert Collect 70% of all Bronze rewards
Anaya Imanu Collect 30% of all Bronze rewards
James Rutland Collect 50% of all Bronze rewards
Lara Croft Collect 10% of all Bronze rewards
Shogo Takamoto Collect 60% of all Bronze rewards
Toru Nishimura Collect 40% of all Bronze rewards
Unknown Entity Collect 100% of all Bronze rewards
Winston Smith Collect 80% of all Bronze rewards
Zip Collect 20% of all Bronze rewards

Unlockable Concept Art  -  Collect all Bronze rewards from the following levels to unlock the concept art

Bolivia Collect all bronze rewards from Bolivia
England Collect all bronze rewards from England
Ghana Collect all bronze rewards from Ghana
Japan Collect all bronze rewards from Japan
Kazakhstan Collect all bronze rewards from Kazahkstan
Nepal Collect all bronze rewards from Nepal
Peru Collect all bronze rewards from Peru
Special Collect all bronze rewards from Croft Manor