Most likely the easiest achievement in the game, all you need to do to gain this achievement is to go to 'PLAY ONLINE' > 'FIND MATCH' and then at the bottom left of the pop up that'll come up you'll see 'ARENAS'.
Simply just vote on random maps, giving a like and dislike to maps, when you use all of your likes and dislikes you'll gain the achievement. You can remove the votes afterwards if you want to.