Here is the full list of all 26 Conarium achievements.
Experience the first ending.
Reach the Mansion for the second time.
Reach the ruins under Rub'al Khali.
Don't get caught by the mummies in the Connection halls.
Solve the puzzle on the cellar door without any clues.
Reach the final level.
Experience the second ending.
Check all the wooden masks in the mansion.
Get all notebook drawings in the game.
Solve the radio room puzzle.
Examine all the notes and diagrams in the game.
Reach the Connection halls.
Solve the symbol drawing puzzle at the first try.
Check all the books in the base and the mansion.
Examine all objects in the game.
Get on the submarine.
Walk out of opposite sides of the map outside the base.
Manage to run the Link Elevator.
Provide electricity to the base.
Find all documents in the game.
Get all secrets in the game.
Get all trophy items in the game.
Use the walkietalkie voluntarily, in every location that it is available.
Finish the game without dying.
Die in five different ways.
Finish the game with 100% progress.