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