Here is the full list of all 45 Flatout 3: Chaos & Destruction achievements.
Complete all challenges.
Kill 10000 zombies.
Complete 25 challenges.
Play a multiplayer game.
Complete a challenge.
Win all Nightshift races.
Win all races.
Win all Uranium Mine races.
Win all Harbor races.
Win all Vienna races.
Win all Outdoor races.
Win all Rome races.
Win all Detroit races.
Complete all stunts.
Win a Nightmare stunt.
Win all Monstertruck challenges.
Win all Speed tracks
Win all Offroad races.
Win all Utah Offroad races.
Win all Kansas Offroad races.
Win all Big Battle Arenas.
Win all normal Battle Arenas.
Win an Industrial stunt.
Complete all splatout levels.
Score a 150 hit combo.
Be destroyed by a train.
Score a 100 hit combo.
Score a 60 hit combo.
Get a score of 7 million.
Score a 50 hit combo.
Score a 40 hit combo.
Score a 30 hit combo.
Score a 20 hit combo.
Score a 10 hit combo.
Kill one zombie.
Win a normal Battle Arena match.
Win a Big Battle Arena match.
Drive into water.
Finish a Nightshift race as loser.
Win on a reversed track.
Win a Nightshift race.
Win on a Speed track.
Win a Monstertruck challenge.
Win a Golf stunt.
Win a race.