minecraft-assets/assets/minecraft/advancements/story/obtain_armor.json

{
    "display": {
        "icon": "minecraft:iron_chestplate",
        "title": "Obtain armor"
    },
    "parent": "minecraft:story/smelt_iron",
    "criteria": {
        "iron_helmet": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:iron_helmet"
                    }
                ]
            }
        },
        "iron_chestplate": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:iron_chestplate"
                    }
                ]
            }
        },
        "iron_leggings": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:iron_leggings"
                    }
                ]
            }
        },
        "iron_boots": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:iron_boots"
                    }
                ]
            }
        }
    },
    "requirements": [
        [
            "iron_helmet"
        ],
        [
            "iron_chestplate"
        ],
        [
            "iron_leggings"
        ],
        [
            "iron_boots"
        ]
    ]
}