Full list of all 30 Jet Set Radio achievements worth 400 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Finish the game without anyone latching onto you with your first attempt
Create a graffiti in all sizes
Use all graffiti in missions
Collect all Graffiti Souls
Unlock Pots and use him as a player character
Unlock all songs in the bonus menu
Unlock all characters
Complete all missions with any rating
Complete every level with Jet rating
Unlock Love Shockers and use her as a player character
Unlock Noise Tank and use him as a player character
Unlock unmasked Poison Jam
Unlock Poison Jam and use him as a player character
Unlock Goji and use him as a player character
Draw graffiti 5 times on Helicopters
Complete a level without collecting a Recovery Spray Can
Complete Chapter 3
Complete Chapter 2
Complete Chapter 1
Tag out at least one rival gang member within 30 seconds
Draw graffiti 5 times on Onishima's back
Shove the two civilians in No.540 level before the choppers show up
Unlock Garam and use him as a player character
Perform a 100+ trick combo
Complete Tutorial
Perform a Turn Trick in game
Make 100 civilians jump out of your way
Fall more than 20 meters off a building
Unlock Gum and Tab
Start game for the first time