Here is the full list of all 50 Blur achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox 360.
Wreck your first Rival in a One-on-One
Beat Khan in his One-on-One
Beat Rhymer in his One-on-One
Beat Talon in his One-on-One
Master Race events
Master Fan Demands
Beat the twins in their One-on-One
Beat Carver in his One-on-One
Prove yourself by completing Rival Demands in career
Beat Shannon again in her One-on-One
Complete everything in the singleplayer game
Master Fan Runs
Win a race in 4 player Split Screen
Earn all Primary Lights in M.Haruna Checkpoint without damaging your car
Win a race in multiple playlists
Master the Shunt Power-up
Master the Mine Power-up
Master the Bolt Power-up
Master the Nitro Power-up
Master the Barge Power-up
Finish a race 0.1 seconds or less ahead of another player online
Race at each location in the game
Beat Natalya in her One-on-One
Become an Award-winning racer
Beat Drayke in his One-on-One
Win a race using a custom mod setup
Stand out from the crowd with car resprays
Share your first Blur experience on Facebook, Twitter or Xbox LIVE
Beat Shannon in her One-on-One
Unlock Shannon's One-on-One
Choose any Friend as a Rival from the Single Player Leaderboards
Earn your first Fan Target
Complete your first Fan Run
Beat a Rank 50 player
Wreck your first car
Wreck a Blur developer on Xbox LIVE, or anyone with this Achievement
Evade or destroy your first incoming Power-up
Have a complete experience of Friend Challenges
Explore Blur's locations
Master Destruction events
Master Checkpoint events
Master the Shock Power-up
Master the Repair Power-up
Master the Shield Power-up
Show that you can bring the fight to One-on-Ones
Hit set speeds in class A, B, C and D cars
Earn every Primary Light on Hard difficulty
Master the Blur Challenges
Unlock Legend Mode
Earn the Motor Mash sticker