Here is the full list of all 50 Starfield achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Gather 500 Organic Resources
Collect 10 Ships
Land on 100 Planets
Gather 500 Inorganic Resources
Eliminate 300 Creatures
Visit all Star Systems
Complete "One Giant Leap"
Reach Level 100
Reach Level 50
Reach Maximum Relationship Level with a Companion
Mod 50 Weapons
Complete "Executive Level"
Complete "Guilty Parties"
Join Ryujin Industries
Complete "A Legacy Forged"
Complete "The Devils You Know"
Complete "Unearthed"
Collect 20 Quantum Essence
Join the UC Vanguard
Complete "Entangled"
Complete "In Their Footsteps"
Complete "High Price to Pay"
Complete "Further Into the Unknown"
Read 20 Skill Magazines
Complete "Legacy's End"
Complete "The Best There Is"
Join the Crimson Fleet
Complete "All That Money Can Buy"
Complete "Into the Unknown"
Recruit 10 Separate Companions
Bypass 50 Digital Locks
Complete "The Hammer Falls"
Complete "Surgical Strike"
Reach Level 25
Complete 30 Activities
Join the Freestar Rangers
Complete 30 Terminal or Misc. Missions
Access 50 Computers
Successfully Smuggle Contraband
Visit 20 Star Systems
Connect 5 Outposts with Cargo Links
Eliminate 300 Human Enemies
Craft 100 Items
Produce 500 Total Resources from Outposts
Modify a Ship
Reach Level 10
Build an Outpost
Join Constellation
Reach Level 5
Enter Space for the First Time