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