Successfully complete the game under the indicated difficulty setting to unlock the cheat option:
Infinite Breath - Easy difficulty
Sunglasses - Easy difficulty
Textureless Mode - Easy difficulty
Show Enemy Health - Complete all four Peru Time Trial levels
Golden Shotgun - Complete all three Lost Island Time Trial levels
Silver Mini SMGs - Complete all three Lost Island Time Trial levels
Infinite Mini SMG Ammo - Complete all three Egyptian Time Trial levels
Infinite Health - Complete all three Egyptian Time Trial levels
Infinite Shotgun Ammo - Complete all four Greece Time Trial levels
All Weapons - Complete all four Greece Time Trial levelS
Infinite 50 Caliber pistol ammo - Complete all four Peru Time Trial levels
Collect the relic in the indicated level to unlock the bonus:
Camouflage suit - Temple Of Khamoon level
Cat suit - Sanctuary Of The Scion level
Classic suit - The Lost Valley level
Croft Manor Sport suit - Midas' Palace level (Athenian Owl relic)
Golden suit - Midas' Palace level (Griffin Head relic)
Legend suit - Mountain Caves leve
Doppelganger suit - Natla's Mines
Maria Doria level - Great Pyramid level
Scorched Natla suit - Collect all relics
Midas Palace: Turn golden:
Have Lara stand onto Midas' hand until she turns to gold.
Save on medipacs:
If you are low on health, wait until you get to a checkpoint. Save the game at that point. Load the game. This will take you to where you were previously and with a full health bar. This is useful, as it saves on medipacs which you will need later in the game. Alternately, if Lara is low on health and
you do get to a checkpoint, kill Lara (for example, jump off a high ledge).
This will also take you back to the previous checkpoint with a full health bar.
Complete the indicated level to unlock the music track.
Croft Manor music theme - Croft Manor level.
Style Units level:
Collect all artifacts and relics to get a 100% completion and to unlock the Style Units level under the "Special" option in the "Rewards" menu.
To turn in solid gold, you need to be in the Mida's Palace level. Step onto Mida's hand (which you use to turn the silver blocks into gold), and stay
there for a short period of time and you will turn gold.