Elearning, pédagogie, technologie et numérique...

Now you can earn game achievements in learning new things. Considering how popular this simple idea seems to be in gaming, it should be effective. Some form of feedback, especially if it is immediate and pleasing in some way, is usually helpful.

I don't know if this will replace paid credits, but it is a start toward a new paradiam

This is an interesting idea to use in the classroom. It would motivate students to improve their skills to achieve these badges. I would suggest implementing these with some incentive system so that students pursue these badges instead of earning them passively as useless labels. These badges can be useful to track progress of historical thinking skills.