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