Here is the full list of all 14 Anodyne 2: Return to Dust achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Visit the Blue Vale
Exit the Albumenium
Enter Nanoscale for the first time
Reach the bottom of the Spire.
Clear the storm and visit the Outer Sands.
Successfully Confront the Center.
Finish the preparations for the Anodyne.
Purchase something from the Metashop.
Visit an Unzone.
Learn from a Metainfo point.
Get a Metacoin!
Find 200 Metacoins!
Find 400 Metacoins!
Find 500 Metacoins!