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