Full list of all 27 No Man's Sky achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 22 achievements, and there is 1 DLC pack containing 5 achievements.
Claim a Base or Buy a Freighter
Build an Exocraft
Visit another Player's Base
Reach the Centre of the Galaxy in Survival Mode
Reach the Centre of the Galaxy in Permadeath Mode