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