custom_mc_advancements/data/canopy/advancements/challenge_complete.json

{
    "display": {
        "icon": {
	    "item": "minecraft:observer"
        },
        "title": "Challenge Complete",
        "description": "Managed 100 days without dying, I guess you're alright.",
        "frame": "task",
        "announce_to_chat": true
    },
    "parent": "canopy:challenge_accepted",
    "criteria": {
		"alive_100_days": {
			"trigger": "minecraft:location",
			"conditions": {
				"player":  {
					"type_specific": {
						"type": "player",
						"stats": [
							{
								"type": "minecraft:custom",
								"stat": "minecraft:time_since_death",
								"value": {
									"min": 2400000
								}
							}
						]
					}
				}
			}
		}
	}
}