Titan Graveyard
Trial: Finish the level after taking 100 points in poison damage
This one is pretty straight forward. It is much easier with a full health bar and full light magic. One Hundred points in damage is equal to half a fully expanded Health bar. At the start of the level just jump in the fog. Take as much damage as you are comfortable with, head over to the other side and get your health back up with light magic and continue if needed.
Fire Pinnacle
Trial: Finish level without allowing pan to recover any health.
This one relies on your ability to block and counter. Firstly avoid all magic as much a possible. If you happen to get hit while your opponent uses the opposite magic, he will get health from it. The trick is to counter all his attacks, then hit him 3-4 times and repeat. As you get your magic back you can use it as you are countering for extra damage and healing. Just make sure you play it safe, get those few hits and turn it off.
Fire Cemetery
Trial: Finish the level after Killing 20 zombies in a single Aerial sequence
At the end of the level when you have to bang on the gongs. 120 zombies will spawn. You need to fill up your shadow magic at the fountain and get them all huddled together in the middle like you are the star of a bukkake. I let them wither away at my health until I was low then enabled Shadow magic and used the combo Y+A+A for controller or L+K+K for keyboard. I killed 25 with this move.
Crematory Oven
Trial: Finish the level and kill 15 summoned Creeper Corpses during the fight against the grave digger.
Simple just wait the Gravedigger out until he summons 15 Creepers. He summons 3 at a time and Holy water destroys them easily.