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
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Subtask A
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Subtask B
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Subtask C
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Here is the link and I'll warn people it isn't pretty at this point.
https://www.icloud.com/shortcuts/1f239ba47ab943afadd75f0b51447b42