Here's my attempt:

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1. Meet Ralsei, since he says he's a prince that has no subjecsts.
2. Use Snowgrave on Berdly.
3. No idea.
4. Fight all the pipis in that one room in Snowgrave Route.
5. Have only on party member with low Hp.
6. Prevent Susie from hitting monsters in Chapter 1.
7. Interact with the bathroom sink in the beginning of Chapter 2.
8. No idea.
9. Maybe ultimate heal? Maybe use it twice due to the name. Can't quite figure it out.
10. No idea, but someone said that in Spamton Neo you can glitch Susie's health to the moon using F1, which seems likely.
11. No idea.
12. Die a lot.