Looking for a way to be able to pull user story data out of rally and look at "Accepted By" value. Only way i know of currently is revision history of each story, but that's not feasible when looking at all the stories for a project.
My first thought would be to use the CA Agile Central Excel Add-in.
Create a new query.
Type: Artifact Change Notification
Filter: Creation Date _ your choice hereColumns: leave blank
Run Query, then filter the results in excel by the Description column
Use the "Text Filter" & Contains option
Enter into SCHEDULE STATE changed from [Completed] to [Accepted] into the Custom AutoFilter box.
The User column gives you the name of who accepted the user story.
Let me know if you need visual aides.
What you said is actually how I solved it too. Before anyone commented I thought to check the Excel Plug-In as I remembered sometimes there is access to more fields then on the Rally UI. Like you said you can do Artifact Change Notification, or there was also a field called "Revision". Either way, it's like you said doing a text filter for that language of Schedule state changed from [COMPLETED] to [ACCEPTED] helps limit the tons of data retuned in the query to roughly what you're looking for. Thanks for your help! glad I could get this answered today!