Here is the full list of all 16 夢游仙境ロマネスク: Chronicles of Refugia achievements.
Finished reading the prologue
Finished reading the main story
Survived the first day
Survived the second day
Survived the third day
Unlocked Ending 1
Unlocked Ending 2
Unlocked Ending 3
Unlocked Ending 4
Unlocked Ending 5
Took Airei's tour
Took Luci's tour
Finished reading all the stories