I followed both of the above- but I have a few things to add about MY personal experience.
I chose the Ninja and the Bridge- same as above. But I had a real hard time with this achievement following JUST that advice. First- don't get any speed points before starting the endo. I discovered those to start kicking in around 168mph or so.
Second- you'll start to stall out around 98 points. I landed a TON of 98's and 99's. BUT- I also did a lot of 120's and 110's. And I didn't get it with those either. I landed my bike at EXACTLY 100 to get this Achievement.
So to be clear; make your points ONLY Endo points and try to drop your back tire at 100, not 101 or 99. Those may not be the exact instructions that everybody finds to be true- but in my experience, it's what FINALLY got this thing unlocked for me.