Infinite golden treasure chest keys
As you progress through the game, you will eventually find the Wizard's Outhouse in the Wizard's backyard. The Wizard's Outhouse is just outside of the Haunted Forest. There is a Kangamoo to the left of the Wizard that drops a chest key each time you kill it. Repeat this as many times as desired.
Easy "Menu Hero" trophy
At the main menu, select the "Settings" option, choose the "Global Setting" selection, then maximize the "good" meter and minimize the "evil" meter to get the "Menu Hero" trophy.
Trophies
Successfully complete one of the following tasks to get a trophy:
Destroyer of Chickens (Bronze): Kill 100 Chickens.
Can't Kill Me... (Bronze): Resurrect at an Outhouse.
Extermination (Bronze): Destroy all 3 Queen Greems.
Man In The Hole (Bronze): Complete 6 Spelunker Quests.
I'm an Addict (Bronze): Drink 50 Potions.
Underground Subway (Bronze): Discover all 30 Teleporting Outhouses.
Menu Hero (Bronze): Dispense the Good, Vanquish the Evil.
The Day the Music Died (Silver): Kill Sergeant Orque.
Extracurricular Activities (Silver): Finish 50 Side Quests.
Justice Dispenser (Silver): Kill 2500 Enemies.
Take Back The Knight (Silver): Kill Lord Von Prong.
Mr. Tough Guy (Gold): Reach Level 20.