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