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