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