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