SEGA Superstars Tennis

In the Superstar adventure mode, complete the singles tournament in the Jet Set Radio court to unlock this Achievement, and the unlockable character Gum.

You must also beat all the challenges prior to the singles tourney, as winning each challenge unlocks the next.

SEGA Superstars Tennis: Stuck to yor Blades achievement;

To unlock this character you'd have to go through the Singles Tournament at the 'JetSet Radio' court in the Superstar mode, but in order to unlock the tournament, you'd have to play through each of the other challenges to reach the bottom of the list.

I found the hardest challenges to complete in this set were closer to the end of the list, 'You Got Graffiti Soul' & 'Score With Paint'

I played through the game not knowing what a Dropshot was so when it come to those challenges i was pretty bad but a reminder wouldn't hurt.

Dropshot: (X-then-A)

I hope this solution helps, if there's anything you think may need updating, just throw me a comment or a PM and i'll see to it that the solution keeps up to date.