Here is the full list of unlockable achievements for Dirt 3 on the Xbox 360. The gamer points you receive from unlocking the achievement is listed in parenthesis.
Air Miles (15) – You have won a race in every location
Assistance is Futile (20) – You won a race without the use of any Driver Assists
Battered Battersea (50) – You completed 100% of the Battersea Compound Missions
Burnt Rubber (30) – You completed 75% of the Battersea Compound Missions
California Dreams (20) – You earned yourself a podium finish at the X Games Tournament
Call me Ace! (15) – You have completed a sensational performance in a Gymkhana Championship event
Can’t Touch This! (10) – You have survived a round of Outbreak without being infected (Pro Tour & Jam Session)
Cheeze It! (10) – You evaded the cats, won the game and earned the fans
Cool Running (10) – You have beaten the bobsleigh in the DC Bobsleigh Challenge
Crash Proof (10) – You used a flashback to take you to victory after facing defeat
DC Challenger (30) – You have completed all of the DC Challenges
DC Gold (10) – You earned all gold medals in the DC Challenges
DC Silver (10) – You earned all silver medals in the DC Challenges
Donut Addict (20) – You completed 50% of the Battersea Compound Missions
Driven (20) – You have won DiRT Tour races using vehicles from every discipline
Driving School (10) – You completed all of the Gymkhana tutorials
Eat my DiRT! (50) – You have unlocked Driver Rep level 30
Flag Stealer (10) – You stole the flag from the opposing team 5 times in a game of Transporter (Pro Tour)
From DiRT to Glory (50) – You have achieved first place finishes in all DiRT Tour Events
Gym-Carnage (20) – You scored 500,000 points in a Gymkhana Event
Gymkhana Aficionado (30) – You completed all Gymkhana Championships in the DiRT Tour
Honorable Driver (10) – You competed via Xbox LIVE and earned a ‘Cautious’ rating
Hooning Around (10) – You completed 25% of the Battersea Compound Missions
Into the DiRT (10) – You have completed your first DiRT Tour race
Join the Party (20) – You won a game in every party mode
Kick Off the Training Wheels! (20) – You have achieved a podium finish in the Gymkhana Academy
King of the Road (10) – You have won an Xbox LIVE race in Hardcore mode
No-bot Wars (20) – You smashed every robot in a Smash Attack DC Challenge
Pace Setter (15) – You have completed time trials using cars from each class of Rally
Perfect Sprint (20) – You gave a flawless performance in a Gymkhana Sprint DC Challenge
Platinum Performance (20) – You earned all platinum medals in the DC Challenges
Rally Evolution (10) – You have experienced key vehicles from Rally history and triumphed
Reputation Boost (10) – You have completed 5 bonus Race Objectives
Rising Talent (10) – You have unlocked Driver Rep level 10
Road Trip (10) – You shared the experience of the Battersea Compound with your friends
Self Preservation Society (10) – You won a race using the Mini Cooper without receiving any damage
Shake and Bake (30) – You have unlocked Driver Rep level 20
Showcase Drifter (20) – You have drifted past 25,000 points in a Drift Showcase DC Challenge
Steer Hunter (10) – You have completed a game of Invasion without any negative points (Pro Tour)
Sub Zero Hero (20) – You earned yourself a podium finish Winter X Games Tournament
Super Star (30) – You earned yourself enough fans to be considered a ‘Superstar’
SuperSeries Champion (100) – You won the DC SuperSeries Championship
Taking the Trophy (20) – You have won 10 Xbox LIVE games
Teacher’s Pet (20) – You earned a platinum medal in each one of the Gymkhana tutorials
The Extra Mile (20) – You have completed 25 bonus Race Objectives
The Professional (10) – You completed your first Xbox LIVE Pro Tour Race
The Real Thing (10) – You have experienced the thrill of Rally first hand and beat your competitors
The Road Ahead (15) – You have completed 25 Xbox LIVE games
Today’s Forecast is… Victory! (20) – You have earned victories in all weather conditions
World Renowned (20) – You have achieved first place finishes and passed the DC Challenge in a World Tour event