minecraft-assets/assets/minecraft/advancements/adventure/root.json

{
    "display": {
        "icon": "minecraft:map",
        "title": "Adventure",
        "description": "Adventure, exploration and combat.",
        "background": "minecraft:textures/gui/advancements/backgrounds/adventure.png"
    },
    "criteria": {
        "killed_something": {
            "trigger": "minecraft:player_killed_entity"
        },
        "killed_by_something": {
            "trigger": "minecraft:entity_killed_player"
        }
    },
    "requirements": [["killed_something"], ["killed_by_something"]]
}