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