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