This achievement asks you to clear one trial with any character. Easy enough to do!
On the main menu, highlight Challenges and hit A. It will bring up a list. On that list has Trials. Hit that and you'll be entering the character selection screen.
To make this easy on you, just select Ryu, which is what I did as well.
His first move is the Collarbone Breaker. When the trial begins, move close to your opponent, then press/hold forward and hit Y on your control pad. Ryu will execute the move, the trial is completed, and the achievement is unlocked right then and there.
Have fun and good luck!