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