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