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