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