Once you have repaired the hovercraft at the Mamago garage (beginning of the game), head to the city and in the pedestrian district. Once there, enter in the Akuda bar and talk to the shark named Francis near the pellet table.
He'll challenge you to a game which consists of sending your pellets to the other side of the table. Once all pellets are on Francis' side, you win. It's really a simple game but can be somewhat troublesome if you go too fast. Simply take your time to adjust each throw rather than missing the angle. You need to win 2 rounds to beat him once. Repeat this 2 more times for the achievement to pop.