Here is the full list of all 50 Starfield achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Reach Level 25
Read 20 Skill Magazines
Join the Crimson Fleet
Complete 30 Terminal or Misc. Missions
Eliminate 300 Human Enemies
Bypass 50 Digital Locks
Complete 30 Activities
Craft 100 Items
Complete "Into the Unknown"
Access 50 Computers
Join the Freestar Rangers
Successfully Smuggle Contraband
Build an Outpost
Reach Level 10
Modify a Ship
Join the UC Vanguard
Join Constellation
Reach Level 5
Enter Space for the First Time
Complete "All That Money Can Buy"
Complete "Further Into the Unknown"
Complete "High Price to Pay"
Complete "In Their Footsteps"
Complete "Entangled"
Complete "Unearthed"
Complete "One Giant Leap"
Complete "The Devils You Know"
Complete "A Legacy Forged"
Complete "Surgical Strike"
Complete "The Hammer Falls"
Join Ryujin Industries
Complete "Guilty Parties"
Complete "Executive Level"
Complete "The Best There Is"
Complete "Legacy's End"
Connect 5 Outposts with Cargo Links
Produce 500 Total Resources from Outposts
Visit 20 Star Systems
Visit all Star Systems
Land on 100 Planets
Gather 500 Organic Resources
Gather 500 Inorganic Resources
Mod 50 Weapons
Recruit 10 Separate Companions
Reach Maximum Relationship Level with a Companion
Collect 20 Quantum Essence
Collect 10 Ships
Eliminate 300 Creatures
Reach Level 50
Reach Level 100