custom_mc_advancements/data/canopy/advancements/now_were_talking.json

{
    "display": {
        "icon": {
	    "item": "minecraft:diamond_sword"
        },
        "title": "Now We're Talking",
        "description": "Kill 100 phantoms... still not enough.",
        "frame": "task",
        "announce_to_chat": true
    },
    "parent": "canopy:a_good_start",
    "criteria": {
        "100_phantoms": {
            "trigger": "minecraft:location",
            "conditions": {
                "player":  {
                    "player": {
                        "stats": [
				{
				    "type": "minecraft:killed",
                                    "stat": "minecraft:phantom",
			            "value": {
                                        "min": 100
				    }
                                }
                        ]
                    }
                }
            }
        }
    }
}