I've got the achievement for winning the whole shebang, but I'm still missing the one for getting into the Finale? is there something else I need to do, besides make it into the top 3?

Anyone have tips? I've played through the game a few times and I haven't been able to defeat Trigga at any point. I also have always ended up with the crappy props no matter which option I pick (fight for the best, let my friends pick first, walk over elegantly), though I'm not sure if that scene even changes depending on the choice....

I only have 5 achievements left to get: mini stunt 7, most congenial, fan favourite, and two hidden ones. Does anyone have any advice on the best way to achieve them?