No big secret here,
from the Main Menu, go to > World of CHEL
Assuming you created a player when you got the game you should be ready to find a match right away. If you haven't done this, take 5-10 mins customizing a player class you feel comfortable with. For this mode I would recommend going with a bigger player.
You'll either be at a page with a bunch of xp and hockey gear on it (Challenge Page) or the side bar menu. You want to go to the Threes Eliminator and find a match. You can invite friends from the dressing room or play alone with random teammates in the tournament.
Now you just need to win one game in the tournament which is not hard. Big hits, good passes and cross creases are your best bet to help get the W with whomever you're playing with.
You can enter in a new tournament right away if you don't win the first game so don't get discouraged, keep searching and playing games and eventually this achievement will pop.