To destroy the Magnifryer with James (if you have followed him at the start), use Troggs. Troggs cannot take magical damage and the Magnifryer's beam is counted as magical.
Notice that the Earth God "James" is a large worm. Naturally, as "James" is the long form of "Jim", this is a reference to Earthworm Jim, published by Shiny, the developers of Sacrifice.
First, summon one or four creatures, then let them die. Hellmouth works best, because it drops five souls. Summon four of them to increase your souls by twenty.
Once you have two or three Manaliths erected, start building shrines at mana fountains as you advance farther from your altar. Sac Doctors can take souls there, reducing the risk of being killed as they make the long trek back to your altar.
Successfully complete the game once.
Get 9 Boons in a row.
To unlock the Marduk model to play in multiplayer/skirmish, beat the game with either Stratos, Pyro or Charnel.