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Tomb Raider: Underworld

Unlockable Extras

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 

Unlockables

Lara’s Bathing Suit - Complete the game on any difficulty setting and this is unlocked in Treasure Hunt mode when you revisit the Mediterranean Sea Expedition. 
Treasure Hunt Mode - Complete the game on any difficulty to unlock Treasure Hunt mode which allows you to revisit all levels to claim treasures/relics missed through storm 

Treasure Hunt Mode

Beat the game once to unlock Treasure Hunt Mode. In this mode you don't have to solve puzzles you've already solved, which allows you to collect the treasures you missed the first time without having to repeat the stuff you did.