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