White swimsuit:
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Successfully complete the game on any difficulty to unlock the white swimsuit
for use in the Mediterranean Sea Expedition.

Treasure Hunt mode:
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Successfully complete the game on any difficulty to unlock Treasure Hunt mode,
which allows the game to be replayed without the puzzle completion requirements
in order to collect any treasure missed in your previous playthrough.

Bonus concept art:
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Successfully complete the indicated task to unlock the corresponding concept art
at the "Extras" menu:

Creature Concepts: Collect all treasures.
Environment Concept Art for Arctic Sea and Amelia Concepts: Successfully
complete Arctic Sea Expedition.
Environment Concept Art for Coastal Thailand and Alister Concepts:
Successfully complete Coastal Thailand Expedition.
Environment Concept Art for Croft Manor and Doppelganger Concepts:
Successfully complete Croft Manor Expedition.
Environment Concept Art for Med Sea and Amanda Concepts: Successfully complete
Mediterranean Sea Expedition.
Environment Concept Art for Mexico and All Men Concepts: Successfully complete
Southern Mexico Expedition.
Environment Concept Art for Ship and Natla Concepts: Successfully complete
Andaman Sea Expedition.
Environment Concept Art for Jan Mayen Island, Gear, and Artifacts Concepts:
Successfully complete Jan Mayen Island Expedition.
Game Flow Storyboards: Successfully complete the game on the Master
Survivalist difficulty.
Lara Concepts: Collect all six Relics.
Zip and Winston Concepts: Successfully complete the Prologue.