Tomb Raider Underworld Cheats

Cheat Codes
Enter during gameplay, you will hear a sound if done correctly.

Hold [L2]. [X], [R2], [Triangle], [R2], [Square], [L1]: Bullet Proof Lara
Hold [L2]. [Triangle], [X], [Triangle], [Square], [L1], [Circle]: One Shot Kills
Hold [L2]. [Square], [Circle], [X], [L1], [R2], [Triangle]: Shows Enemys Health

Trophies
Complete each condition to get the allotted Trophies. There are 20 Bronze Trophies, 8 Silver Trophies, 4 Gold Trophies, and 1 Platinum Trophy.

Artifact Hunter (Bronze): Find 10 artifacts
Climber (Bronze): Do more than 2 wall-jumps that include zig-zag jumps
Exploration of Andaman Sea (Bronze): Complete the exploration of Andaman Sea
Exploration of Croft Residence (Bronze): Complete the exploration of Croft Residence
Grenadier (Bronze): Kill 2 enemies with 1 grenade
Investigation of the Mediterranean Ruins (Bronze): Complete the investigation of the Mediterranean Ruins
Investigation of the North Pole Sea Ruins (Bronze): Complete the investigation of the North Pole Sea Ruins
Investigation of the South Mexico Ruins (Bronze): Complete the investigation of South Mexico Ruins
Investigation of the Thailand Ruins (Bronze): Complete the investigation of the Thailand Ruins
Investigations of the Yanmaien Island Ruins (Bronze): Complete the investigation of the Yanmaien Island Ruins
Master Artifact Hunter (Gold): Find 6 artifacts
Master Climber (Silver): Do more than 4 wall-jumps that include zig-zag jumps
Master Grenadier (Silver): Kill 3 enemies with 1 grenade
Master of Tomb Raider: Underworld (Platinum): Get all the trophies in the game
Master Roadkiller (Silver): Kill 5 enemies with your motorcycle
Master Speed Demon (Gold): Do all three speed demon challenges
Master Swan Diver (Gold): Do all three swan dives
Master Treasure Hunter (Gold): Find 179 treasures
Passionate Artifact Hunter (Silver): Find 3 artifacts
Passionate Treasure Hunter (Silver): Find 100 treasures
Prologue (Bronze): Clear the prologue
Roadkiller (Bronze): Kill an enemy with your motorcycle
Skilled Treasure Hunter (Silver): Find 50 treasures
Speed Demon 1 (Bronze): Rush towards and enter Xibalba. (45 seconds?)
Speed Demon 2 (Bronze): Rush downwards to the bottom of Valgrind. (50 seconds?)
Speed Demon 3 (Bronze): Rush and break through the Valhalla Maze. (40 seconds?)
Survival Master (Silver): Complete the game in the hardest difficulty
Swan Diver I (Bronze): Swan dive from the platform on top of the Craken`s head
Swan Diver II (Bronze): Swan dive from the platform that is at the top of the large ship in the Mediterranean
Swan Diver III (Bronze): Swan dive from the platform into the ocean in Thailand
Treasure Hunter (Bronze): Find 10 treasures
Weapon Expert (Bronze): Do an adrenaline attack headshot
Weapon Master (Silver): Do 10 adrenaline attack headshots

Unlockables
All items can be found under the "Extras" section once the following conditions are met.

All Environment Concept Art for Arctic Sea and Amelia Concepts: Complete Arctic Sea Expedition
All Environment Concept Art for Coastal Thailand and Alister Concepts: Complete Coastal Thailand Expedition
All Environment Concept Art for Croft Manor and Doppelganger Concepts: Complete Croft Manor Expedition
All Environment Concept Art for Med Sea and Amanda Concepts: Complete Mediterranean Sea Expedition
All Environment Concept Art for Mexico and All Men Concepts: Complete Southern Mexico Expedition
All Environment Concept Art for Ship and Natla Concepts: Complete Andaman Sea Expedition
All Environment Concept Art forJan Mayen Island and Gear & Artifacts Concepts: Complete Ja Mayen Island Expedition
Creature Concepts: Collect every single Treasure
Game Flow Storyboards: Complete the entire game on the Master Survivalist difficulty level
Lara Concepts: Collect all six Relics
Zip and Winston Concepts: Complete Prologue