Here is the full list of all 48 HOKUSAI achievements.
Moved an item.
Created 5 scenes in a data file.
Saved 5 data files.
Took a screenshot once.
Entered the information of assets.
Created an asset.
Selected a color of item.
Created the thumbnail of scenes.
Launched the Asset Editor.
Saved 100 data files. (DLC Required)
Renamed a data file.
Unlocked all achievements.
Took screenshots 100 times. (DLC Required)
Read the help or guides.
Exported images 10 times.
Imported an image with size or position changed.
Exported images 100 times. (DLC Required)
Clicked the carousel banner.
Saved a data file.
Loaded an asset.
Loaded 5 assets.
Played 1 hour worth in total.
Saved 10 data files.
Generated a text object.
Favorite an asset from Workshop.
Created 10 scenes in a data file.
Created 15 scenes in a data file.
Previewed an image on scene editing.
Created 5 assets.
Created 10 assets.
Created an asset which has 5 categories.
Created an asset which has 10 categories.
Created an asset which has some colors.
Set the preview image of assets.
Imported a PSD image.
Uploaded an asset to Workshop.
Uploaded 5 assets to Workshop.
Uploaded 10 assets to Workshop.
Exported images once.
Took screenshots 10 times.
Created 100 scenes in a data file. (DLC Required)
Created 100 assets. (DLC Required)
Uploaded 100 assets to Workshop. (DLC Required)
Loaded 100 assets. (DLC Required)
Selected items 100 times while editing a scene. (DLC Required)
Rated 100 assets on Workshop. (DLC Required)
Favorite 100 assets from Workshop. (DLC Required)
Unlocked all achievements, including Extended Edition. (DLC Required)