//Set the icon item
setIcon("minecraft:sapling")

//Set the title String
setTitle("I'm a tree!")

//Set the description String
setDescription("Enter a sapling block")

//Set the parent advancement. The syntax is "modid:folder/path/to/the/advancement/then/filename"
setParent("triumph:example/root")

//Adds criteria named "entered" with the trigger type "minecraft:enter_block". This function returns the criteria as an object
criteria = addCriteria("entered", "minecraft:enter_block")

//Sets the required block oredict for the criteria. A block from this oredict needs to be entered.
criteria.setOreDict("treeSapling")