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