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