Fallout: New Vegas Quests

Tutorial quests

 * Note: with the exception of Ain't That a Kick in the Head, all tutorial quests are optional but must be completed in the order listed here.

Main quests

 * Note: you can skip the entire story-line of They Went That-a-Way and head straight to The Tops in New Vegas to complete the quest.

Main quest arcs
For these quests you must choose one faction to be loyal to. As you follow the main quest arc for a single faction, the quests for the other factions (with the exception of Independent/Yes Man quests) will fail as you gain infamy for siding against them when you progress through the quests for whichever faction you side with. The point at which you fail the other factions' quests varies depending on your actions and quests already completed. Once you side with a faction you can change to another faction's quest arc, only if you have not progressed down the preceding faction's quests to the point that you fail the other quest arcs from gaining infamy.

Completing parts of certain quests for a faction will cause you to fail other quest arcs no matter what. These are indicated in the table below. However, you can still fail quest arcs earlier than this due to infamy etc.

For more information on the scenarios surrounding the game end quests see Fallout: New Vegas endings.

Side quest arcs
These quests can be completed at any time during the game and most do not contribute to the main storyline. Note that some of these quests will not be able to be completed if you have a low reputation with the associated faction.

Unmarked quests
These are quests that can be completed for certain rewards, but do not appear in the Pip-Boy. Several quest names are derived from the Fallout: New Vegas Official Game Guide, pages 288–289.

Dead Money
These quests are only playable after Dead Money is installed. 

Honest Hearts
These quests are only playable after Honest Hearts is installed. 

Old World Blues
These quests are only playable after Old World Blues is installed. The XP that is rewarded for quests is variable based upon your level when the quest is completed. The total XP split between the main storyline quests is approximately 3000 XP at levels 1-4 and 22000 XP at levels 45–50, the secondary quest XP ranges from 75 XP per quest to 550 XP per quest. 

Lonesome Road
These quests are only playable after Lonesome Road is installed. 

Behind the scenes
Many of the side and main quests in Fallout: New Vegas are named after popular songs of famous 1950s singers, such as Dean Martin and Frank Sinatra.