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