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