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