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