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 20th level.
Completed G.I. Blues.
Reached 30th level.
You Discovered 125 locations.
Completed Wild Card.
Completed All or Nothing.
Completed The House Always Wins.
Recruited all companions.
Completed Veni, Vidi, Vici.
Completed Render Unto Caesar.
Healed 10,000 points of damage with food.
Completed Arizona Killer.
Hacked 25 terminals.
Picked 50 pockets.
Won 30 games of Caravan.
Completed Eureka!
Caused 10,000 damage with Energy Weapons.
Caused 10,000 damage with Melee Weapons.
Completed For the Republic.
Completed You'll Know It When It Happens.
Completed Talent Pool.
Got banned from all the Strip's casinos.
Played 10 spins of Slots.
Caused 10,000 damage with Explosives.
Discovered all snow globes.
Caused 10,000 damage with Unarmed weapons.
Played the game from start to finish in Hardcore Mode.
Completed No Gods, No Masters.
Installed 20 weapon mods.
Completed Volare!
Healed 10,000 points of damage with Stimpaks.
Made 50 Speech challenges.
Played 10 spins of Roulette.
Completed Ring-a-Ding-Ding.
Played 10 hands of Blackjack.
Completed The Legend of the Star.
Completed Return to Sender.
Discovered 50 locations.
Caused 10,000 damage with Guns.
Picked 25 locks.
Sold 10,000 caps worth of goods.
Reached 10th level.
Completed They Went That-a-Way.
Completed Come Fly With Me.
Completed That Lucky Old Sun.
Won 3 games of Caravan.
Crafted 20 items.
Recruited a companion.
Repaired 30 items.
Completed Ain't That a Kick in the Head.
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.
Evacuated Zion.
Crushed the White Legs.
Scouted the Zion Valley for signs of the White Legs.
Resupplied Daniel and the Sorrows.
Arrived at Zion.
Recovered X-8 vertebrae-pulse-de-sensitizer frequency!
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.
Decided the fate of all the Divide dwellers.
Find all of ED-E's upgrades in the Divide.
Complete Lonesome Road.
Acquire all upgrades for the Divide's signature weapon.
Detonate all of the warheads in the Divide.
Cause 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.