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