Big Bumpin

This one actually isn't too terrible to get and you have two options:

1. Somehow find four people to play this game online and pick up the charge and make sure they don't hit you before scoring in Power Surge.

2. Play power surge against the computer on the level "Monsoon of Doom". At the beginning just let the computer get the first points and sit at the charge pick up area. After the computer scores they tend to come back in a big cluster. Once they come around the final curve towards you, they have a tendancy to cut it on the inside so if you go down on the outside you can occassionally sneak around them and once you get by you should be home clear.

You can also do it on "Deep Sea" using the same strategy of sitting on the charge points. The A.I. isn't very smart and sometimes will leave you a clear path on that level.

Just be patient and you will have your opportunity.