Here is the full list of all 20 Mall Mayhem achievements.
Get 500,000 points in a single game.
Get 1,000,000 points in a single game.
Hit 20 shoppers in a single game session.
Hit 50 shoppers in a single game session.
This is an Easter egg.
Unlocked the boost ability.
Unlocked the balls of steel ability.
Unlocked the ghost ability.
Unlocked the radial force ability.
Unlocked the second chance ability.
Without you Mall Mayhem would not have been possible.
Die by falling outside of the mall.
Upgraded the engine to Level 3.
Upgraded the brakes to Level 3.
Get 3,000,000 points in a single game.
Get 5,000,000 points in a single game.
Get 7,000,000 points in a single game.
Upgraded stability to Level 3.
Upgraded to 4WD.
Upgraded to a very chaotic and disorienting perspective.