This one is simple and hard at the same time. It's best doing this in a heads up battle so less people change the cards. All you have to do is get lucky and get a hand that's a straight or better and NOT use ANY cheats. It's ok if you get a PvP initiated by your opponent and you win or lose. Just as long as you don't use any cheats and win the hand with a straight or better, the achievement should pop up.