Clear the drains! Achievement
Clear the drains!30
Spiral down a sewer tunnelYou will enter a sewer in a few cases but the main one is 'A Series of Accidents' and 'Plenty of Questions'. You can go back and select the mission after you have completed the game. When you enter the sewers you will come to a big pipe. All you have to do is loop the loop that bit of pipe, I didn't get it first shot as I was going too fast, so use a wee bit of nitro and just steer round it and its yours.