As I said before, Disney Channel Germany has aired all three seasons of Atomic Betty (including the third season, Mission: Earth, and the show's Christmas special, The No-L Nine).
I think DC Japan was the only DCI feed that aired the show (Germany, Spain, Portugal and Japan) that didn't air anything from the show beyond season 1 (only the first season was dubbed in Japanese, and CN Japan also had it prior to DC Japan). Interestingly, DC Germany was also the only Disney Channel international feed that had the show from the start, as I also mentioned before, which is different from how DC Italy and Australia was one of the few DCI feeds to have Even Stevens from the start (Nick Asia had Even Stevens first in 2002, then DC Asia had it in 2004).