Achievements on the Test Server
In the last weeks I have logged into the test server a couple of times and it was always empty. This leads me to the conclusion that the number of players to test your iterations on the test server might not be high enough. Maybe that is because playing on the test server does not do anything for your account on the live server.
Since this is also a community driven project why not reward players for helping in the development process. I know that the live server and the test server are two seperate instances. So maybe you could run a routine that checks fulfilled quests on the test server at midnight and sends an ingame mail with the rewards on the live server? Players use the same login credentials for both servers, right? So you should be able to match the accounts.
You could then control testing by making the corresponding quests, e.g.:
Play 3 sparring matches on Gorgash each lasting at least 8 minutes (Map Testing Gorgash) (70 BFP, 1000 Gold)
Play 3 sparring matches using at least 3 of the following cards A,B,C,D,E,F,G (arbitrary reward)
This could also be a motivation for players that have already fulfilled their daily quests and want to grind more. And if you don't want players to be too much on the test server you can limit the player numbers and set a maximum monthly/weekly reward.