Time Trial Levels:
Bottomless Pit - Beat every level on Archaeologist
Harem - Beat every level on Adventurer
Treasure Room - Beat every level on Grad Student

Movie Trailers:
Raiders of the Lost Ark movie trailer - Collect 3 Artifacts
Temple of Doom movie trailer - Collect 10 Artifacts
The Kingdom of the Crystal Skull movie trailer - Collect 30 Artifacts
The Last Crusade movie trailer - Collect 24 Artifacts

Concept Art:
Allies - Collect 12 Artifacts
Cutting Room Floor - Collect 36 Artifacts
Enemies - Collect 22 Artifacts
Extras - Collect 20 Artifacts
Istanbul - Collect 28 Artifacts
Nepal - Collect 26 Artifacts
Odin and Seabed - Collect 32 Artifacts
Panama - Collect 18 Artifacts
San Francisco - Collect 14 Artifacts
Sudan - Collect 2 Artifacts

Skins:
Big Heads - Collect 6 Artifacts
Henry Jones - Collect 34 Artifacts
Tuxedo Indy - Collect 16 Artifacts