Here is the full list of all 46 BURIED STARS achievements.
Fell into eternal purgatory.
Encountered the attacker unexpectedly.
Saw a particular epilogue event after getting rescued.
Encountered the attacker at the site.
Encountered the conclusion of another possibility.
Saw all of Seil's rapport events.
Discovered the existence of the hidden command center.
Saw the true ending.
Couldn't take another step before the truth.
Rescued but couldn't complete the picture.
Rescued after failing to discover the truth.
Rescued but gave up on truth.
Saw all of Gyu-hyuk's rapport events.
Saw all of Juyoung's rapport events.
Saw all of Inha's rapport events.
Saw all of Hyesung's rapport events.
Recovered more than half of Mental Gage.
You've gone crazy.
Saw the first ending.
Changed the Auto-Write message.
Changed the watch settings.
Opened the watch menu.
Listened to a recording file.
Finished my first recapitulation.
Acquired a new keyword with the conversation.
Began the first keyword conversation.
Played the game for the first time.