Mayhem 3D

If the other solution doesn't work for you, try this:

Exhibition
Domination
The Peanut
Use the fastest monster truck. Should be bottom row, all the way to the right (#46)
Set it to Insane, 7 opponents, monster truck opponents.

This is the mode where you have to push the other cars out of the arena in a given time. You should have no trouble pushing the other slow trucks out with your fast truck on the small peanut map. I got it on the first try with this method in less then 2 mins.

This is how I did it:

- Exhibition
- Banger Race
- The Sidwinger (1st track)
- Used Muscle Car "The Frenchy" if i'm not mistaken that's the name
- Difficulty Set to Insane
- Numjber of laps 1
- 7 opponents (minimum Required to get the achievement),
- Sedan Opponents (there can be other types of cars best suited for this but I did it with this)
- Boost set to INFINITE (this is very important, don't know if this option is available at first in the game or if it's unlocked during career mode... i only did this achievement after career mode was completed at 100%... if it's not available at when you start the game finish the career and it will be there)

This way you can get this achievement done in under 40 seconds like I did... it's just one lap and you can have the boost button pressed from start to finish...

Hope this helps if you are having trouble with the other solution :)

The best way to do this is to start a Demo Derby exhibition on Insane difficulty. Select your opponents to be "Coupes Only" and if you like you can alter the other options of the game if you have unlocked them (I personally left them alone). You can have up to 11 opponents, but I moved it down to 7 because that's the minimum for the achievement.

Choose a monster truck that has decent stats in the armor category (the one with the chain icon is Armor) and when the round starts immediately start driving over enemies until you can obtain about 1,500 - 1,750 points. Now start sandbagging (dodging cars and not hitting anybody) until there are only a few people left. You shouldn't be eliminiated if you scored a lot of points early on. Your Ramming Speed should also be maxed out by now, but if not that's fine.

When there's about 4 cars left (counting you), get back into the fray and start running people over (if you take too much front end damage kick it into reverse). When there are only 2 cars left it becomes "Last Man Standing" so either whip out your Ramming Speed and take him out or run him over until he explodes, and the achievement is yours.