This achievement can be obtained
after finishing Episode 4 by
Steps:
1. Go to the Episode 4 character screen (Main Menu -> Tips -> Ep4 Tips);
2. Once there, click the "Next" button below the portraits and go to the "Witch Side" (which comes right after humans);
3. Click the portrait with an armband with a cross (or with Chiester Sisters if for some reason you're playing with pachinko sprites). Keep clicking until
4. Select "Resurrect" option in the menu below.
5. ????
6. Nihi!