The Mogul Achievement
Win a MUT auction.
To unlock this achievement you have to win a card with a bid, you can’t unlock this by purchasing a card at the buyout price. The easiest way to do this is to search for bronze rated cards, these will be the cheapest, sort them by time left on the auction and bid on a couple cheap cards that are expiring soon. With a little luck no one else will want the cheap low rated cards and you will win at least one of them to unlock the achievement.