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