DiRT Showdown

I found the easiest way to get this achievement is to start up the first rampage event on the Showdown Tour. Then when it starts, pause the game, then go Options > Difficulty and then make sure its on casual. Then what you want to do is just drive around getting light hits on people until you have around 900 points. Once you have this just go and hide or just let them hit you until it gets to double points (30 seconds left). AT THIS POINT YOU MUST BE LAST!
If you are not last hit the restart button an try again. Now as soon as the double points start just go around hitting everyone like normal and because it's on easy you should win. You only need to be top 3 though, so don't worry if your not winning.
Make sure to target low health opposition and try to wreck their car for bonus points.

The hardest bit is being last at double points, but if you do this you should have no trouble.
Good Luck!

This is my solution to Comeback King. Really simple but sometimes a pain because it can be quiet hard to be last. Please watch and rate. Thank you very much.

Difficulty: Casual - Of course

To unlock this achievement you must be in last place as double points begins ( 30 seconds remaining ), then you must score enough points to finish in the top 3, keep a look out for cars with red health, and hit them from the side at high speed for maximum points.

achievement ""comeback king"" is unlocked at the end of this youtube video =

I pretty much did the same thing as AlonsoFive. On the second even in the Showdown Tour, when the ramage event starts I would get a couple of hits in, then sit along the edge of the map making sure I was in last place. When double points kicks in the last thirty seconds, aim for the cars that have little life left because finishing off a car gives you the most points. Also use, your nitrous to help do extra damage. Come in first and get the achievement.