What is this?

The CriterionTriggers will allow you to control the advancements in your mod with the class RestAdvancement. You can create a CriterionTrigger for any advancement, so you can check if the player has the advancement or not. Additionally, you can grant the advancement to the player.

Creating a registry. 0.10>

In order to register criterion triggers you will have to create a registry. To do this, you must use the following code within the init() function:

                                
//This is the init() inside your main class.
public static void init() {
    //Here we create the registry so we can use it later.
    CriterionTriggerRegistry.CreateRegistry(MOD_ID);
}

Creating a CriterionTrigger. 0.10>

In order to register criterion triggers you will have to create a registry, then the following:

                                
//This is another separate class from the initial one. I recommend you do this for organization.
public class AdvancementTriggerManager {
    //Here we create the criterion trigger.
    public static final RestAdvancement advancementTrigger = CriterionTriggerRegistry.CreateAdvancementTrigger(YourModId, YourAdvancementId);

    /*
        Parameters:
            - YourModId = Your mod id as string.
            - YourAdvancementId = Your advancement's id as string.
    */

    //You can create a method/function like this to call it from the main class.
    public static void register() {
        //This registers all of your criterion triggers into minecraft.
        CriterionTriggerRegistry.Register(YourModId);
    }
}

Grant an advancement. 0.10>

To do this, you can do this:

                                
//Here we have your CriterionTrigger.
public static final RestAdvancement advancementTrigger = CriterionTriggerRegistry.CreateAdvancementTrigger(YourModId, YourAdvancementId);

public static void yourMethod() {
    //serverPlayer = A player in the server-side, using the ServerPlayer class.
    advancementTrigger.award(serverPlayer);
}

Check an advancement. 0.10>