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