Here is the full list of all 46 Conception PLUS: Maidens of the Twelve Stars achievements.
Complete Harem ending.
Use all Team Colors.
Complete Yuzuha's ending.
Complete Collette's ending.
Complete Farun's ending.
Complete Sue's ending.
Complete Reone's ending.
Complete a total of 100 Chain Combos.
Complete Mirei's ending.
Complete Femiruna's ending.
Complete Ruka's ending.
Complete Lillith's ending.
Complete Tarua's ending.
Complete Arie's ending.
Complete Normal ending.
Complete main scenario.
Complete Mahiru's ending.
Have 100 Star Children go independent.
Give birth to the special class "Ninja."
Give birth to a Star Child of each class.
Complete a total of 8 Chain Combos.
Insta-kill 100 Impurities.
Clear 12 Constellation Labyrinths.
Perform the Tri-Mating ritual.
MECUNITE a total of 10 times.
Give birth to the special class "Bondsman."
Give birth to the special class "Dungeon Master."
Clear 6 Constellation Labyrinths.
Clear 4 Constellation Labyrinths.
Clear 3 Constellation Labyrinths.
Give birth to the special class "Sage."
Clear 2 Constellation Labyrinths.
Have 25 Star Children go independent.
Give birth to 12 Star Children.
Visited the Map Point "Gift Shop."
Clear 1 Constellation Labyrinth.
Visited the Map Point "Scavenger."
Visited the Map Point "Day Camp."
Give birth to your first Star Child.
Obtain all achievements.
Give birth to 200 Star Children.
Complete all quests.
Obtain all weapons.
Obtain all armor.
Obtain all accessories.
Complete Alfie's ending.