Well, here they are folks
http://www.xbox360achievements.org/a...php?gameID=381 
Winning Streak 30 Win 3 race events back to back in either Arcade or Single Player Career Mode.
1-2 Finish 10 Complete a Ranked Match Team Championship with your team taking the top two positions.
Team Domination 20 Complete a Ranked Match Team Championship with your team taking up the top four positions.
Team Leader 10 Earn the most points for your team in a Ranked Match Team Championship.
Showboater 20 Earn 9000 Kudos in a single race.
5-Star Racer 20 Earn 5 Kudos Stars.
Superstar 40 Earn 5 Kudos Stars three times in a race.
Mind Your Manners 25 Win a Street Race in Arcade or Gotham Career mode without making contact with walls.
The Unicyclist 20 Perform a long Wheelie on a motorcycle.
Bibendum 10 Play all 3 Test Track disciplines and set a score in each one.
Weather Master 25 Win races in rain, fog, and snow in either Arcade or Single Player Career modes.
Winner 5 Win your first event in either Arcade or Single Player Career modes.
Silver Gotham Arcader 40 Earn a Silver medal in every Arcade event.
Gold Gotham Arcader 10 Earn a Gold medal in every Arcade event.
Platinum Gotham Arcader 10 Earn a Platinum medal in every Arcade event.
Silver Double 30 Earn at least a Silver medal with both a bike and a car in any Arcade event.
Gold Double 5 Earn at least a Gold medal with both a bike and a car in any Arcade event.
Platinum Double 5 Earn at least a Platinum medal with both a bike and a car in any Arcade event.
Arcade Chapter Complete 30 Complete any chapter in Arcade mode.
Professional 70 Reach the rank of Professional in Single Player Career mode.
Hotshot 70 Reach the rank of Hotshot in Single Player Career mode.
Master 40 Reach the rank of Master in Single Player Career mode.
Hero 20 Become a National Champion in Single Player Career mode.
Champion 10 Win your first Championship in either Single Player Career or Ranked Match play.
Motorcycle Ace 25 Win a Single Player Career Championship on a motorcycle.
Major Winner 40 Win a Major in Single Player Career mode.
Dominator 20 Win all three Single Player Career Majors.
Stuntman 5 Perform your first stunt on a bike.
Buy an Achievement 20 Buy the K1,000,000 gamer picture to earn this Achievement.
Back it Up! 10 In a split-screen Street Race, finish 1st and 2nd in reverse gear against at least one AI opponent.
Strike a Pose 10 Get two bikes facing each other, 15 metres apart, with each performing an impressive endo.
First Timer 10 Complete your first Ranked Match Championship.
8th Wonder of the World 20 Complete a lap of the Michelin Test Track 'figure of 8' while sliding.
Catch 'Em All 5 Swap paint with every opponent in an eight vehicle race.
Endo King 20 Earn 100 Kudos by performing an Endo with a motorcycle.
Seat of your Pants 25 Complete a Hot Lap event in Arcade mode without touching your brake.
Rubbin' is Racin' 20 Knock off the wing mirrors on all of your opponents' vehicles in a Single Player Street Race event.
Show Jump 10 Get eight vehicles in the air at the same time.
I Love PGR 5 Buy everything in the PGR Shop or complete PGR 3 and get to Rank #1
Whitewash 50Win every event in a Single Player or Ranked Match Championship.
You Won't Believe Your Eyes! 5 Create a 3D image using Photo Mode.
Secret Agent 5 Puzzle #2
3CZV657 5 Puzzle #1
Tonight Make Me Unstoppable 5 Puzzle #3
Play It Again Sam 20 Improve on a medal earned in any arcade event
PGR On Demand - Photo 5 Upload a photo and vote on a photo in PGR On Demand
PGR On Demand - Video 5 Upload a replay and vote on a replay using PGR On Demand
Giant Killer 20 Win against a human opponent with Rank 1 single player status on Xbox LIVE.
Numero Uno 50 Reach Rank Number One on the Single Player Career Drivers' Leaderboard.
Beat Bizarre 10 Defeat a PGR 4 team member on Xbox LIVE, or defeat anyone who's bested a PGR 4 team member.
PGR4 Achievements :) 
Balloon Hunter Champion!
Linear Mode
