Here is the full list of all 49 Lorena and the Land of Ruins achievements.
Defeated a total of 100 or more enemies.
Defeated a total of 500 or more enemies.
Defeated a total of 1000 or more enemies.
Survived 10 or more waves of enemies in any Hunt stage (Normal mode or higher).
Survived 30 or more waves of enemies in any Hunt stage (Normal mode or higher).
Survived 50 or more waves of enemies in any Hunt stage (Normal mode or higher).
Defeated your first enemy.
Cleared the Erut Ruins.
Cleared the Erut Ruins on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Erut Ruins on Normal mode or harder without taking damage or saving mid-stage.
Received an S rank after clearing the Erut Ruins on Normal mode or harder.
Cleared the entire game.
Cleared the Zwiek Ruins.
Received an S rank after clearing the Zwiek Ruins on Normal mode or harder.
Received an S rank after clearing the Zwiek Ruins: Hunt stage on Normal mode or harder.
Cleared the Zwiek Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the Zwiek Ruins on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Zebelin Ruins.
Received an S rank after clearing the Zebelin Ruins on Normal mode or harder.
Received an S rank after clearing the Zebelin Ruins: Hunt stage on Normal mode or harder.
Cleared the Zebelin Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the Zebelin on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the T'eu Tori'al Ruins.
Received an S rank after clearing the T'eu Tori'al Ruins on Normal mode or harder.
Cleared the T'eu Tori'al Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the T'eu Tori'al Ruins on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Flaktum Ruins.
Received an S rank after clearing the Flaktum Ruins on Normal mode or harder.
Received an S rank after clearing the Flaktum Ruins: Hunt stage on Normal mode or harder.
Cleared the Flaktum Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the Flaktum on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Bun'kha Ruins.
Received an S rank after clearing the Bun'kha Ruins on Normal mode or harder.
Cleared the Bun'kha Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the Bun'kha on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Rakyeta Ruins.
Cleared the Rakyeta Ruins on Normal mode or harder without firing a single shot or saving mid-stage.
Cleared the Rakyeta Ruins on Normal mode or harder without taking damage or saving mid-stage.
Received an S rank after clearing the Rakyeta Ruins on Normal mode or harder.
Cleared the Magint Ruins.
Received an S rank after clearing the Magint Ruins on Normal mode or harder.
Received an S rank after clearing the Magint Ruins: Hunt stage on Normal mode or harder.
Cleared the Magint Ruins on Normal mode or harder without taking damage or saving mid-stage.
Cleared the Magint on Normal mode or harder without firing a single shot or saving mid-stage.
Discovered all historical documents left behind in all ruins.
Defeated 10 or more enemies in a single attempt at a Hunt stage.
Defeated 100 or more enemies in a single attempt at a Hunt stage.
Defeated 500 or more enemies in a single attempt at a Hunt stage.
Caught all of the Fairweather Butterflies.