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