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