Full list of all 75 Fallout: New Vegas achievements worth 1,655 gamerscore. It takes around 60-80 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 5 DLC packs containing 25 achievements worth 655 Gamerscore.
Completed Return to Sender.
Recruited all companions.
Completed The Legend of the Star.
Won 30 games of Caravan.
Completed Talent Pool.
Hacked 25 terminals.
Got banned from all the Strip's casinos.
Made 50 Speech challenges.
Completed All or Nothing.
Completed The House Always Wins.
Picked 50 pockets.
Caused 10,000 damage with Explosives.
Played the game from start to finish in Hardcore Mode.
Completed Eureka!
Completed For the Republic.
Completed You'll Know It When It Happens.
Discovered all snow globes.
Won 3 games of Caravan.
Completed Veni, Vidi, Vici.
Completed Render Unto Caesar.
Completed Arizona Killer.
Caused 10,000 damage with Energy Weapons.
Reached 30th level.
Installed 20 weapon mods.
You Discovered 125 locations.
Healed 10,000 points of damage with Stimpaks.
Healed 10,000 points of damage with food.
Completed No Gods, No Masters.
Completed Wild Card.
Caused 10,000 damage with Guns.
Reached 20th level.
Discovered 50 locations.
Caused 10,000 damage with Unarmed weapons.
Completed Volare!
Completed That Lucky Old Sun.
Completed Ring-a-Ding-Ding.
Caused 10,000 damage with Melee Weapons.
Played 10 hands of Blackjack.
Played 10 spins of Roulette.
Played 10 spins of Slots.
Completed G.I. Blues.
Reached 10th level.
Completed They Went That-a-Way.
Completed Come Fly With Me.
Sold 10,000 caps worth of goods.
Picked 25 locks.
Recruited a companion.
Crafted 20 items.
Repaired 30 items.
Completed Ain't That a Kick in the Head.
Trapped Father Elijah in the Sierra Madre's Vault.
Confronted Father Elijah in the Sierra Madre's Vault.
Completed the Sierra Madre Gala Event.
Recruited Dean Domino, Christine and Dog.
Collected 500 Sierra Madre Chips.
Evacuated Zion.
Crushed the White Legs.
Scouted the Zion Valley for signs of the White Legs.
Resupplied Daniel and the Sorrows.
Arrived at Zion.
Reactivated all of the Sink's robotic assistants.
Completed Old World Blues.
Made up your mind... about your brain.
Recovered X-13 cardiac regulator sneaky suit!
Recovered X-8 vertebrae-pulse-de-sensitizer frequency!
Detonated all of the warheads in the Divide.
Found all of ED-E's upgrades in the Divide.
Completed Lonesome Road.
Decided the fate of all the Divide dwellers.
Acquired all upgrades for the Divide's signature weapon.
Completed any three Gun Runners' Arsenal (GRA) three star (***) Challenges.
Caused 10,000 damage with unique Mojave Wasteland weapons.
Completed any three Gun Runners' Arsenal (GRA) two star (**) Challenges.
Caused 10,000 damage with Gun Runners' Arsenal (GRA) Weapons.
Completed any three Gun Runners' Arsenal (GRA) one star (*) Challenges.