Full list of all 68 The Outer Worlds achievements. It takes around 40-50 hours to unlock all of the achievements in the base game on Windows.
The base game contains 48 achievements, and there are 2 DLC packs containing 20 achievements.
Used the medical inhaler 300 times.
Had 75% or higher negative reputation with 3 factions.
Killed an enemy under the effects of 4 science weapons.
Completed The Outer Worlds on hard difficulty.
Completed The Outer Worlds on supernova difficulty.
Saved Edgewater permanently.
Dealt with the cartographer.
Simultaneously had bonuses for meat, carbohydrates, sugary drink, caffeine, and alcohol.
Brokered peace between the Iconoclasts and MSI.
Killed 50 enemies with companion abilities.
Completed The Outer Worlds on any difficulty.
Landed on Tartarus.
Skipped the Hope.
Skipped the Hope into the sun.
Brought robo-destruction to Edgewater.
Learned the shocking truth about the colony.
Completed the SubLight quest lines.
Completed all companion quests.
Starred in an Odeon Pictures movie.
Wore 'A Nice Hat' and 'Chimaera' at the same time.
Killed an enemy with a science weapon sneak attack during TTD, with a weakspot critical hit.
Landed in Byzantium.
Won the battle of Stellar Bay.
Finished a companion's quest line.
Turned 100 enemies to ash with plasma damage.
Stopped the Monarch broadcasts.
Killed 20 enemies that were infected by spreading N-rays.
Killed 50 enemies with a tossball stick or tossball blocker.
Recruited all of the companions.
Reached Stellar Bay.
Acquired 3 flaws.
Hit 30 enemies in the groin during tactical time dilation.
Succeeded at 3 dialog conversation checks with a single disguise.
Character level 30 reached.
Simultaneously equipped Spacer's Choice brand clothing, headgear, and 4 weapons.
Raised a skill to 100.
Killed an enemy that was hit with all 5 damage types.
Killed 30 automechanicals with shock damage.
Sold 10,000 bits worth of items to vendors.
Had 75% or higher positive reputation with 3 factions.
Saved the universe's greatest diet toothpaste recipe.
Used dialog skills 30 times in conversations.
Improved your gear 30 times through tinkering and mods.
Got your very own ship.
Killed 50 enemies with sneak attacks.
Killed a mega creature.
Recruited a companion.
Landed in Emerald Vale.
Completed Murder on Eridanos on any difficulty.
Acquired Spectrum Gatling, The Needler, and Udder Buddy.
Received an invitation to Eridanos.
Completed Peril on Gorgon on any difficulty.
Acquired Special Delivery, P.E.T., and Employee Benefits.
Found 20 Portable Phonographs.