Here is the full list of all 31 OPUS: The Day We Found Earth achievements.
Scan a star in Dark Section [三]
Complete all Zone5 main missions
Complete All sub missions
Complete all Zone4 main missions
Scan 10 Lisa-found exoplanet
Complete all Zone3 main missions
Complete 6 sub missions
Complete all Zone2 main missions
Scan 10 planets in the LISA Solar System
Complete 3 sub missions
Scan 100 stars
Scan 5 planets in the LISA Solar System
Inspect 20 items in the spaceship
Complete 1 sub mission
Name 3 exo-planet or object
Scan 5 Lisa-found exoplanet
Scan 5 stars with non-exoplanets in a row
Scan 2 stars with non-exoplanets in a row
Name an exo-planet or object
Scan 20 stars
Inspect 10 items in the spaceship
Inspect 5 items in the spaceship
Complete all Zone1 main missions
Scan 1 Lisa-found exoplanet
Scan 5 stars with no planets in a row
Scan 5 stars
Scan 1 planet in the LISA Solar System
Scan 2 stars with no planets in a row
Inspect 1 item in the spaceship
Scan 500 stars
Scan 1000 stars