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.
Reached 30th level.
Recruited all companions.
Completed Talent Pool.
Caused 10,000 damage with Explosives.
Completed All or Nothing.
Completed The House Always Wins.
Completed No Gods, No Masters.
Completed Wild Card.
Completed Veni, Vidi, Vici.
Completed Render Unto Caesar.
Completed Arizona Killer.
Caused 10,000 damage with Unarmed weapons.
Caused 10,000 damage with Melee Weapons.
Installed 20 weapon mods.
Completed Eureka!
Completed For the Republic.
Completed You'll Know It When It Happens.
Completed The Legend of the Star.
Hacked 25 terminals.
Got banned from all the Strip's casinos.
Completed Return to Sender.
Healed 10,000 points of damage with Stimpaks.
Discovered all snow globes.
Made 50 Speech challenges.
You Discovered 125 locations.
Sold 10,000 caps worth of goods.
Caused 10,000 damage with Energy Weapons.
Completed Volare!
Repaired 30 items.
Reached 20th level.
Played 10 spins of Slots.
Played 10 spins of Roulette.
Completed G.I. Blues.
Caused 10,000 damage with Guns.
Crafted 20 items.
Completed Ring-a-Ding-Ding.
Picked 25 locks.
Played 10 hands of Blackjack.
Discovered 50 locations.
Recruited a companion.
Won 3 games of Caravan.
Reached 10th level.
Completed That Lucky Old Sun.
Completed They Went That-a-Way.
Completed Come Fly With Me.
Completed Ain't That a Kick in the Head.
Pick 50 pockets.
Heal 10,000 points of damage with food.
Win 30 games of Caravan.
Play the game from start to finish in Hardcore Mode.
Confronted Father Elijah in the Sierra Madre's Vault.
Trapped 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-13 cardiac regulator sneaky suit!
Reactivated all of the Sink's robotic assistants.
Recovered X-8 vertebrae-pulse-de-sensitizer frequency!
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.
Completed any three Gun Runners' Arsenal (GRA) one star (*) Challenges.
Completed any three Gun Runners' Arsenal (GRA) two star (**) Challenges.
Caused 10,000 damage with Gun Runners' Arsenal (GRA) Weapons.
Complete any three Gun Runners' Arsenal (GRA) three star (***) Challenges.