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