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