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