The Root of All Evil: Surf the donut down the river for 20 seconds [Bronze / 20G]
Location: Mission 3 Towards the end of the third mission you will go down a river. When the blue marker on the screen says that you are 190 meters away from your next main objective, look for a donut shaped object in the water. It's shortly after you encounter a bunch of Cell Operatives. You can only go in one direction, so it's basically impossible to miss. Press Square (PS3) / X (X360) and jump on the donut to start surfing. There are two small obstacles along the way. One time you need to crouch and one time you need to jump. Go back to the main menu and restart from the last checkpoint if you fall down.