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