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