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