Here is the full list of all 12 Namaiki Dark Elf Sisters achievements.
The cat is out of the bag.
Paint the walls white with your choices more than 5 times.
Let’s establish a new religion.
The first experience turned out to be quite rough.
I'm not done tasting it yet.
My precious white liquid was stolen!
Hence the story begins.
Letting it out inside is the symbol of love.
Think about all the broken hearts.
Dark elves are superior to other elves.
Time is money. Gotta do it quickly.
Spill your seed with your choices more than 5 times.