I think the real power behind this type of thing is in the ingenuity and imagination of the DC community. I get amazed at how many different and creative ways we all get to the answer... and I think that's what I'd like to be able to browse through. It's a wonderful way to spread ideas, so not just that we've completed a task, but how (or where or what) we've completed it. As a compiled list, I think the benefit would be much greater than the sum of the parts.
So for that reason, I think it'd be best if the "results" of each task can be viewed together with how they're fullfilled by each member... but also, it'd be nice to have a member view so that you could view how a member has worked through their tasks. It's another interesting view into who we are. Maybe that's where the results are edited (in your Member profile)?
Question: we're doing this now, but down the line a wee bit new members will want to join and run through the tasks. They'd want to be able to be added to the list and complete the tasks running up to the present tasks. So their names get added to the bottom of each task. Is that how you see it??
I'm guessing that the badge could link to a member page with their listing of tasks? And just like the "Donate to Author" link, you could have a "Net Citizen" link to that page that you could display on your web page??