I don't understand German so well. But it's important to know that the Milestone list at Geocaching.com may not be the same as the one at Project-GC due to many reasons, here are some:
Retracted caches does not exist at Project-GC. Sometimes they have been logged before being retracted.
Lab caches does not exist at Project-GC. I do not know if these affects the milestone list.
Milestones at Geocaching.com can be re-ordered by the user. That is not possible at Project-GC (yet).