[ Register or Signin to view external links. ]
The No Tumbler Fumbler for Fallout: New Vegas is worth 15 G

If you have the Old World Blues DLC, this achievement can be quite easy. At the X-13 Research Facility, there is a Test Terminal. Upon selecting any of the tests turn left and go through the double doors. To your right are two locked doors. One has an easy lock and the other has an average lock. These locks reset if you pass or fail any of the tests. Just return to the Test Terminal and restart any of the tests and repeat until you have the achievement.