Bronze

Credit Where Credit is Due
Achieve a perfect Credit score in an offline race

Clean Credits
Achieve the Clean Race Credit Bonus in an offline race

9 Lives
Cause severe damage to a Supercar in an offline race without retiring

Crash test dummy
Completely demolish a Supercar in an offline race

Glued to the track
Complete a race without going off the track. On or offline

Rebellious Victory
Win a 3 lap race at Homestead Oval without braking once. On or Offline

Lap Master
Maintain first place for an entire lap. On or offline

No Fear!
Go full throttle and hold off the brakes for 15 seconds in a on or offline race

Circuit Challenge
Win a race at Nurburgring without hitting any obstacles or barriers. On or offline

Stage 1 Check
Complete all Objectives in Stage 1 of Career mode

Stage 2 Check
Complete all Objectives in Stage 2 of Career mode

Stage 3 Check
Complete all Objectives in Stage 3 of Career mode 

New Style
Create your first new Livery

Race Off
Create your first online race

Continental Racer
Race online against a driver from another country

HUD Zen
Win a race without the HUD. On or Offline

Challenge Accepted
Complete Stage 1 of Career mode with over 2,000 Race Points

Passport Stamped
Complete Stage 2 of Career mode with over 6,000 Race Points

Challenger
Finish the Career with over 24,000 Race Points

Looking Left
Complete a California Oval race without turning right. On or Offline

Who is the Fairest?
Win a race with no side mirrors. On or Offline

Finished in First!
Win a race crossing the line in first gear, on or offline

Silver

Not counted out
Start a race in 16th and finish in 1st. On or offline

Styling ‘n’ Profiling
Take a Supercar with a personalized livery online and win

Show Off
Achieve a fastest lap during an online race

Up and Coming
Complete Stage 3 of Career mode with over 10,000 Race Points

Stage 4 Check
Complete all Objectives in Stage 4 of Career mode

Story of a Champion
Finish the Career with over 28,000 Race Points

Wet Paint
Win a race in the wet, without receiving any damage, on or offline

Shopaholic
Spend 100,000 Credits

Millionaire
Achieve a Credit balance of 1,000,000

Gold

Bound for Glory
Complete Stage 4 of Career mode with over 18,000 Race Points

Stage 5 Check
Complete all Objectives in Stage 5 of Career mode

Career Cruiser
Finish the Career with over 32,000 Race Points

Solid Gold
Complete a Tournament event with maximum points overall (90)

Platinum

Superstar
Unlock all Supercar Challenge Trophies

Source: http://www.community.eu.playstation.com/playstationeu/board/message?board.id=149&message.id=6821