Here is the full list of all 9 What Remains of Edith Finch achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
See Johann's name in the ending credits
Clear all balls off the pool table
Let the drunken sailor finish his song
Catch 2 rabbits with only 2 swoops
Knock all the letters of Gregory's name into the bathtub
Play Calvin's story again
Look in all peepholes and telescopes long enough to hear Edith's commentary
Take both paths to the house
Finish all stories