Here is the full list of all 24 The Impregnation of the Elves: Conquest of the Arrogant Fairies by Impregnation achievements.
Defeat all the Elves in Challenge Mode
Achieved Ending 2
Defeated by Idun
Defeated by Frigga
Defeated by Nimue
Defeated by Vivian
Destroy Vivian's armour completely
Achieved Ending 1
Victory over Idun
Destroy Idun's armour completely
Victory over Frigga
Destroy Frigga's armour completely
Victory over Nimue
Destroy Nimue's armour completely
Victory over Vivian
Victory over Nineve
Destroy Nineve's armour completely
Defeated by Nineve
Victory over Dryad
Destroy Dryad's armour completely
Defeated by Dryad
Passed a question once
See the Goddess' True Form
Unlock all achievements