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