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