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