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Entweder den Vorschlag von Jakuje mit dem Kartenvergleich machen, oder die Karte der Challenge-Caches (unter "Werkzeuge" zu finden) aufrufen.
http://project-gc.com/Tools/Challenges?map=create&country=Germany&cachename=&archived=on&show=all
english:
Either do what Jakuje suggests or try the map of challenge caches
There you can see all challenge caches. You can see the ones you fulfill, the ones you do not fulfill yet and the ones you have found. But this method is limited to one country.
If I understand your question correctly (Google translate and my basic German knowledge):
Well, if I could see which and how much challenge I've made
You can use Map Compare and the fact that every challenge cache has to have word "challenge" in the name (requires active membership):
project-gc.com/Tools/MapCompare?profile_name=punschy&onefound=on&cachename_contains=challenge&submit=Filter