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