Fallout: New Vegas Achievements and Trophies

General information
The PC version of Fallout: New Vegas uses Steamworks for achievements, and the Xbox 360 version uses Xbox LIVE. Unlike Fallout 3, the retail PS3 version shipped with PSN trophy support.

(As noted by many mod authors, use of mods in-game can prevent achievements from completing when attained.)

PC achievement security measures
Steamworks achievements are subject to a number of additional security measures, set up to ensure that achievements are awarded legitimately.

First and foremost, using the console on the PC version for any reason will disable achievements for that play session. This includes non-controversial commands such as. Simply opening the console will not disable achievements; a command must be entered and run via the console.

In either case, achievements can be re-enabled by exiting the game completely and re-loading the game. Loading a saved game in which the console has been used will not disable achievements.

If achievements are disabled when an Achievement Trigger Event occurs (such as winning your thirtieth game of Caravan), achievement progress will be reset and the player will have to redo the entire achievement (i.e. winning thirty more Caravan games) Alternatively a game save from before the trigger event can be loaded.