To fulfill the Jasmer Challenge you have to find caches placed in every month since the begin of geocaching in May, 2000 (see also https://www.geocaching.com/blog/2018/10/the-jasmer-challenge/)
In Austria the first cache "Austria's First" (GCE47) was placed in May, 2001".
Last year I was really happy to log the Austrian Jasmer Challenge (GC6XM6X). So I think it was too bad that this cache has been archived. To give other cachers the opportunity to log this challenge: HERE IT IS AGAIN! - at the posted coordinates.
Challenge Condition:
To complete this challenge, you must fill your Jasmer grid by finding caches placed in every month since geocaching began in Austria in June, 2001. It doesn't matter where the caches have been hidden.
To find out if you are already able to log this challenge or to find out which months are missing, use the tool like https://project-gc.com/Statistics/ProfileStats to view your ‘Finds by hidden month' (see my result below).
Um diese Challenge zu loggen, muss die Jasmer Matrix "Funde nach Versteckdatum" seit Beginn des Geocachings in Österreich im Juni 2001 vervollständigt sein. Es spielt keine Rolle, wo die Caches versteckt wurden.
Um herauszufinden, ob du die Challenge bereits erfüllst oder welche Monate dir noch fehlen, verwende das Tool wie z. B. auf https://project-gc.com/Statistics/ProfileStats "Funde nach Versteckdatum" (siehe mein Ergebnis unten).
You can also use the following checker:
Alternativ kannst du auch folgenden Checker verwenden:
I wish you much fun with this Challenge! 
Ich wünsche euch viel Spaß mit dieser Challenge!