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