Here is the full list of all 26 Myst achievements.
Achieved one of the brothers' endings while on a randomized playthrough.
Fill up all of the shelf space for a page type.
Made it through the maze in Selenitic without pressing "backtrack" on a randomized playthrough.
Found the skeleton in the Mechanical Age.
Achieved the good ending within two minutes.
Achieved the good ending without inserting a single red or blue page.
Achieved bad ending with Sirrus.
Achieved bad ending with Achenar.
Achieved the bad ending with Atrus.
Returned to Myst Island from D'ni.
Achieved the good ending.
Solved the fireplace puzzle.
Found the white page.
Found a way back from Channelwood.
Found Sirrus' message to Achenar.
Rode the tree to the highest position.
Opened the safe in the cabin.
Found a way back from Mechanical.
Solved the gear puzzle inside of the clocktower.
Found a way back from Stoneship.
Solved the compass puzzle.
Found a way back from Selenitic.
Solved the piano puzzle in a single try.
Solved the generator power puzzle.
Raised the sunken ship.
Viewed some dated constellations.