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