Tomb Raider: Anniversary Cheats

Unlockable costumes
Camouflage suit: Obtain the relic from the Temple of Khamoon
Catsuit: Obtain the relic from the Sanctuary of the Scion
Classic: Obtain the relic from The Lost Valley
Croft Manor Sport: Obtain the Athenian Owl relic from Midas's Palace
Golden: Obtain the Griffin-Head relic from Midas's Palace
Legend: Obtain the relic from the Mountain Caves

Unlockable Cheats
Infinate Breath: Complete game on Easy difficulty
Sunglasses: Complete game on Easy difficulty
Textureless Mode: Complete game on Easy difficulty
Show Enemy Health: Complete all Peru Time Trials
Golden Shotgun and Silver Mini SMGs: Beat all three Lost Island time trials
Infinite 50 Caliber Pistol Ammo and Show Enemy Health: Beat all four Peru time trials
Infinite Mini SMG Ammo and Infinite Health: Beat all three Egyption time trials
Infinite Shotgun Ammo and All Weapons: Beat all four Greece time trials

Unlockable Commentaries
To unlock these commentaries, complete the chapter of the commentaries, as shown below. Once the commentaries are unlocked, switch them on in the Options menu, and then go back through the levels of the unlocked commentaries and activate the new crystals by pressing Interact. You'll here a short commentary from two of the game creators.

Croft Manor commentaries: Complete Croft Manor
Egypt commentaries (Temple of Khamoon, Obelisk of Khamoon, and Sanctuary of the Scion): Complete Egypt
Greece commentaries (St. Francis' Folly, The Coliseum, Midas' Palace, and the Tomb of Tihocan): Complete Greece
Lost City commentaries (Natla's Mines, The Great Pyramid, and the Final Conflict): Complete Lost City
Peru commentaries (Mountain Caves, City of Vilcabamba, The Lost Valley, and the Tomb of Qualopec): Complete Peru