Here is the full list of all 15 Lovers of Aether achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Take Absa to the Homecoming Dance
Take Everyone to the Homecoming Dance
Take Clairen to the Homecoming Dance
Take Etalus to the Homecoming Dance
Take Sylvanos to the Homecoming Dance
Take Forsburn to the Homecoming Dance
Take Maypul to the Homecoming Dance
Take Kragg to the Homecoming Dance
Take Wrastor to the Homecoming Dance
Take Ranno to the Homecoming Dance
Take Orcane to the Homecoming Dance
Ace the History Quiz
Take Zetterburn to the Homecoming Dance
Complete all 3 Levels in the Computer Lab Game
Take Elliana to the Homecoming Dance