There is no guide for this game yet. But apparently it is EASY POINTS!
De Ragan Slayer - 100 points
Defeat the Chapter 3 boss.
Onmagoug Slayer - 100 points
Defeat the Chapter 5 boss.
Adahna Degahna Slayer - 100 points
Defeat the Chapter 7 boss.
De Ragnus Slayer - 100 points
Defeat the Chapter 8 boss.
Magas Maggahna Slayer - 100 points
Defeat the Chapter 9 boss.
Dimmagolus Slayer - 100 points
Defeat the Chapter 11 boss.
Dulk Fakis Slayer - 200 points
Defeat the Chapter 12 boss.
Dulk Fakis 2 Slayer - 200 points
Defeat the last boss.