GWENT: The Witcher Card Game

If you want to learn how to win matches, an achievement solution is not the place to be turning to. Check YouTube and watch pros explain the meta game and various mechanics. If you can already win matches, here is what you do:

When you are in a match, you need to get to the point of the third round where your opponent has passed and you still have cards remaining. Once they have passed, you have won the round (if you have more strength), but the game lets you continue playing until you also pass.

If you have more than 2 cards in your hand, play them now. It doesn't matter what you do with them, as long as you leave 2. Once you have done that and only have 2 cards left, go ahead and pass.

This is virtually the only way to pursue this achievement that I can imagine. The alternative is randomly unlocking it while going for other achievements, like I did.