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