Alternate Costumes - Collect the relics in the various levels to unlock alternate costumes.

Each new relic collected will unlock another costume.

Legend suit
Camouflage suit
Cat suit
Classic suit
Croft Manor Sport suit
Golden suit
Tomb Raider 2 Maria Doria level suit
Doppelganger suit
Scorched Natla suit

Artwork - Complete the indicated task to unlock the corresponding Art Gallery.

Atlantean Creatures: Complete the game.

Box Art: Collect 67% of the Artifacts in Peru.

Doppelganger: Collect 67% of the Artifacts in Lost City.

Egypt: Collect 100% of the Artifacts in Egypt.

Game Gallery: Collect 33% of the Artifacts in Greece.
Greece: Collect 100% of the Artifacts in Greece.

Items And Artifacts: Complete the game with 25% of the Relics.

Kid: Collect 33% of the Artifacts in Egypt.
Kold: Collect 67% of the Artifacts in Egypt.

Lost City: Collect 33% of the Artifacts in Lost City.

Natla: Collect 100% of the Artifacts in Lost City.

Origins of Lara: Collect 33% of the Artifacts in Peru.
Other Characters: Complete the game with 50% of the Artifacts.

Peru: Collect 100% of the Artifacts in Peru.
Pierre: Collect 67% of the Artifacts in Greece.
Promotional Images: Collect 50% of the Artifacts in Mansion.

TR:1 vs. TR:A Egypt: Collect 100% of the Relics in Egypt.
TR:1 vs. TR:A Greece: Collect 100% of the Relics in Greece.
TR:1 vs. TR:A Lost City: Collect 100% of the Relics in Lost City.
TR:1 vs. TR:A Peru: Collect 100% of the Relics in Peru.

Attacking raptors safely in Lost Valley - When you slide down the slope and the raptors charge at you, ready to attack, there is a rock where they cannot get you. As soon as you enter the valley, jump on the rock to your left. You will be able to shoot them, and they will not be able to attack you.

Better jumps - When jumping up stairs, pull out your gun(s), but do not shoot. Hop forward, and you will glide smoothly up the stairs.

Biographies - Collect the indicated number of artifacts to unlock the corresponding biography.

Doppelganger: 36 artifacts
Kid: 14 artifacts
Kold: 18 artifacts
Lara Croft: 5 artifacts
Larson: 9 artifacts
Natla: 41 artifacts
Pierre: 23 artifacts
Richard Croft: 32 artifacts
Winston: 27 artifacts

Complete the indicated task to unlock the corresponding cheat option.

Infinite Breath: Complete the game.
Sunglasses: Complete the game.
Textureless Mode: Complete the game.
Infinite 50 Caliber pistol ammo: Complete all four Peru Time Trial levels.
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.

Easy Croft Manor maze - You must go through a maze at Croft Manor to collect Artifacts. The easiest way to go through the maze is to stick to the walls. By doing this, the camera will move to a view on top of Lara, and you can actually see what is on the other side of walls.

Midas Palace: Turn Golden - Have Lara stand onto Midas' hand until she turns to gold.

Music - Complete the indicated level to unlock the corresponding music track.

Croft Manor music theme: Croft Manor level.

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.

Style Units Level - Collect all relics to unlock the Style Units level under the 'Special' option in the 'Rewards' menu.

Turing gold - In Mida's Palace, step onto Mida's hand (which you use to turn the silver blocks into gold), and stay there for a short period of time to be turn into solid gold.