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