I created a shortcut that others might find useful which creates a record of completed shortcuts. It is designed with the Goodtask 3 format in mind. It isn't pretty, but it does serve my purposes and I thought others might enjoy it. I did put in some basic comments to get things started. The ability to remove reminders is there but disabled initially so I don't have people shooting flaming arrows at me.
The format of the output in Drafts looks like this:
- 2019-02-04 Test - A Completed Reminder
- Subtask A
- Subtask B
- Subtask C
Here is the link and I'll warn people it isn't pretty at this point.