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.
Completed Murder on Eridanos on any difficulty.
Killed the Slug Queen.
Chose to either infect or cure Eridanos.
Received an invitation to Eridanos.
Used the Discrepancy Amplifier.
Investigated every suspected and reported to Administrator Ludovico.
Discovered the biggest secret in the aetherwave industry.
Acquired Spectrum Gatling, The Needler, and Udder Buddy.
Killed 50 Infected Humans or Parasites.
Asked a companion to be the Bad Inspector.
Completed Peril on Gorgon on any difficulty.
Powered the reactor.
Destroyed the Synthesizer.
Listened to Lucky Montoya's message.
Found Olivia Ambrose's journal.
Found Lucky Montoya's body.
Delivered the journal to Lucien.
Found 20 Portable Phonographs.
Achieved a compromise between Olivia and Minnie.
Acquired Special Delivery, P.E.T., and Employee Benefits.