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