Gun Runner's Arsenal adds the last 5 achievements and 125 gamerscore points. Lonesome Road adds 5 achievements again worth 125 gamerscore points. Old World Blues adds an additional 5 achievements worth 125 gamerscore points. Honest Hearts adds another 5 achievements worth 140 gamerscore points.
Dead Money adds 5 more achievements worth 140 gamerscore points. The base game has 50 achievements and 1000 gamerscore points. (As noted by many mod authors & users, use of mods in-game can prevent achievements from completing when attained.) Unlike Fallout 3, the retail PS3 version shipped with PSN trophy support. The PC version of Fallout: New Vegas uses Steamworks for achievements, and the Xbox 360 version uses Xbox LIVE.
