custom/stuff/root.json

{
    "display": {
        "icon": {
            "item": "minecraft:planks",
            "data": 2
        },
        "title": "A Root",
        "description": "The root of this tree.",
        "background": "minecraft:textures/gui/advancements/backgrounds/stone.png",
        "frame": "task",
        "show_toast": true,
        "announce_to_chat": true
    },
    "criteria": {
        "Criteria_Name": {
            "trigger": "minecraft:bred_animals",
            "conditions": {
                "parent": {
                    "type": "minecraft:cow"
                }
            }
        }
    },
    "rewards": {
        "recipes": ["minecraft:stone_pickaxe","minecraft:enchanting_table"],
        "loot": ["minecraft:entities/enderman", "minecraft:chests/simple_dungeon"],
        "experience": 20,
        "commands": [
            "/say @s has completed this advancement",
            "/give @s ender_pearl 1 0"
        ]
    }
}