No missable achievements (plus 26 unknown)
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Provide electricity to the base.
Manage to run the Link Elevator.
Get on the submarine.
Reach the Connection halls.
Reach the Mansion for the second time.
Reach the ruins under Rub'al Khali.
Reach the final level.
Check all the wooden masks in the mansion.
Experience the first ending.
Walk out of opposite sides of the map outside the base.
Solve the symbol drawing puzzle at the first try.
Get all notebook drawings in the game.
Experience the second ending.
Examine all the notes and diagrams in the game.
Solve the radio room puzzle.
Check all the books in the base and the mansion.
Don't get caught by the mummies in the Connection halls.
Examine all objects in the game.
Finish the game without dying.
Die in five different ways.
Find all documents in the game.
Use the walkietalkie voluntarily, in every location that it is available.
Get all secrets in the game.
Solve the puzzle on the cellar door without any clues.
Get all trophy items in the game.
Finish the game with 100% progress.