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 Render Unto Caesar.
Completed Veni, Vidi, Vici.
Completed Arizona Killer.
Repaired 30 items.
Completed That Lucky Old Sun.
You Discovered 125 locations.
Hacked 25 terminals.
Completed No Gods, No Masters.
Completed Wild Card.
Played the game from start to finish in Hardcore Mode.
Completed All or Nothing.
Completed The House Always Wins.
Caused 10,000 damage with Explosives.
Caused 10,000 damage with Melee Weapons.
Caused 10,000 damage with Unarmed weapons.
Caused 10,000 damage with Energy Weapons.
Healed 10,000 points of damage with Stimpaks.
Reached 30th level.
Caused 10,000 damage with Guns.
Recruited all companions.
Completed Return to Sender.
Completed Eureka!
Completed For the Republic.
Completed You'll Know It When It Happens.
Picked 25 locks.
Installed 20 weapon mods.
Made 50 Speech challenges.
Discovered all snow globes.
Discovered 50 locations.
Reached 20th level.
Completed Talent Pool.
Completed Volare!
Completed G.I. Blues.
Reached 10th level.
Completed Ring-a-Ding-Ding.
Played 10 hands of Blackjack.
Played 10 spins of Roulette.
Played 10 spins of Slots.
Crafted 20 items.
Sold 10,000 caps worth of goods.
Completed They Went That-a-Way.
Completed Come Fly With Me.
Recruited a companion.
Completed Ain't That a Kick in the Head.
Pick 50 pockets.
Heal 10,000 points of damage with food.
Win 3 games of Caravan.
Win 30 games of Caravan.
Get banned from all the Strip's casinos.
Complete The Legend of the Star.
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.
Confront Father Elijah in the Sierra Madre's Vault.
Crushed the White Legs.
Evacuated Zion.
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!
Found all of ED-E's upgrades in the Divide.
Completed Lonesome Road.
Acquired all upgrades for the Divide's signature weapon.
Decided the fate of all the Divide dwellers.
Detonate all of the warheads in the Divide.
Completed any three Gun Runners' Arsenal (GRA) two star (**) Challenges.
Caused 10,000 damage with unique Mojave Wasteland weapons.
Caused 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) three star (***) Challenges.