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