if you are playing the WP version too, stop your progress at level 24 and upload your save file to the cloud. Download it to the other device and reach level 25 on each to get this achievement on both versions. I reached level 50 on my PC and then started the game on my phone. On downloading the saved game I got all of the achievements except this one on my WP. So don't do this until you want to start the game afresh on your phone.
Similar rules apply for, when you Upload your game on WP and download on Win 8 after reaching level 25. The achievement won't unlock in the Win 8 version. (Confirmed by- Illum1na).