The SharePoint 2013 Tasks list didn’t show all fields. Instead one had to click “Show More” in order to see the complete set of fields to be updated.
When creating the list, I wouldn’t have selected the fields if I didn’t think users should actually fill them out 🙂 , so I wanted to show the whole list by default. I found this helpful discussion thread about a script that can be added to the Display or Edit Form page to show all data. … just added a Content Editor web part and pointed to my script (I saved it in a library) and it worked like a charm 🙂