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
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
Unlock unmasked Poison Jam
Unlock Poison Jam and use him as a player character
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 Goji and use him as a player character
Complete all missions with any rating
Tag out at least one rival gang member within 30 seconds
Draw graffiti 5 times on Helicopters
Shove the two civilians in No.540 level before the choppers show up
Draw graffiti 5 times on Onishima's back
Complete Chapter 3
Complete Chapter 2
Complete Chapter 1
Perform a 100+ trick combo
Complete a level without collecting a Recovery Spray Can
Unlock Garam and use him as a player character
Make 100 civilians jump out of your way
Fall more than 20 meters off a building
Create a graffiti in all sizes
Unlock Gum and Tab
Complete Tutorial
Perform a Turn Trick in game
Start game for the first time