Really easy way to get achievement!
Change to a different language by going to "help and options" then puzzle language. then choose and language. Once it loads click on the leader boards tab and it will automatically show the "best of right now" with a number next to it. That's how many people are playing the game in that language. All you have to do is keep switching languages tell you find one with less than 10 people playing and then start.
If you want to see how many top 10 wins you have in that language just go to leader boards and click on "me". It will show you how many top 10 wins you have at the bottom of the list. (shows how many top 10 wins you have for the language you are currently switched to)
This achievement has to be done all in one language (you cant get 3 in one language and 7 in another). The achievement won't pop up until you get the 10th top 10 win in that specific language.