Here is the full list of all 50 Starfield achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Gather 500 Organic Resources
Reach Level 100
Complete "Legacy's End"
Visit all Star Systems
Complete "The Best There Is"
Land on 100 Planets
Eliminate 300 Creatures
Mod 50 Weapons
Collect 10 Ships
Complete "A Legacy Forged"
Complete "The Devils You Know"
Produce 500 Total Resources from Outposts
Gather 500 Inorganic Resources
Complete "Executive Level"
Connect 5 Outposts with Cargo Links
Complete "Guilty Parties"
Complete "The Hammer Falls"
Reach Level 50
Complete "Surgical Strike"
Complete "One Giant Leap"
Craft 100 Items
Complete "Unearthed"
Collect 20 Quantum Essence
Complete "Entangled"
Join the Crimson Fleet
Complete "In Their Footsteps"
Complete "High Price to Pay"
Reach Level 25
Access 50 Computers
Complete "Further Into the Unknown"
Eliminate 300 Human Enemies
Visit 20 Star Systems
Read 20 Skill Magazines
Reach Maximum Relationship Level with a Companion
Successfully Smuggle Contraband
Build an Outpost
Bypass 50 Digital Locks
Complete "All That Money Can Buy"
Join Ryujin Industries
Complete 30 Terminal or Misc. Missions
Complete 30 Activities
Complete "Into the Unknown"
Recruit 10 Separate Companions
Join the UC Vanguard
Join the Freestar Rangers
Modify a Ship
Reach Level 10
Reach Level 5
Join Constellation
Enter Space for the First Time