How to use

getAdvancement

method

in

net.minecraft.advancements.AdvancementManager

public static void grantCriterion(EntityPlayerMP player, ResourceLocation advancementId, String criterion) {
  PlayerAdvancements advancements = player.getAdvancements();
  AdvancementManager manager = player.getServerWorld().getAdvancementManager();
  Advancement advancement = manager.getAdvancement(advancementId);
  if(advancement != null) {
    advancements.grantCriterion(advancement, criterion);
  }
}

private boolean hasRelicAlready(EntityPlayer player, int relic) {
  if(relic < 0 || relic > relicStacks.length || !(player instanceof EntityPlayerMP))
    return true;
  EntityPlayerMP mpPlayer = (EntityPlayerMP) player;
  Item item = relicStacks[relic].getItem();
  ResourceLocation advId = ((IRelic) item).getAdvancement();
  if(advId != null) {
    Advancement adv = mpPlayer.getServerWorld().getAdvancementManager().getAdvancement(advId);
    return adv != null && mpPlayer.getAdvancements().getProgress(adv).isDone();
  }
  return false;
}

@Override
public Advancement getAdvancementOnPickup(ItemStack stack, EntityPlayer player, EntityItem item) {
  MinecraftServer server = FMLCommonHandler.instance().getMinecraftServerInstance();
  return server.getAdvancementManager().getAdvancement(new ResourceLocation(Wizardry.MODID, "advancements/advancement_devildust.json"));
}

public static void syncPlayer(EntityPlayerMP player, boolean showToast) {
  PlayerAdvancements advancements = player.getAdvancements();
  if(advancements == null)
    return;
  
  AdvancementManager manager = player.getServer().getAdvancementManager();
  
  List<String> completed = new LinkedList<>();
  for(ResourceLocation res : syncedAdvancements) {
    Advancement adv = manager.getAdvancement(res);
    AdvancementProgress p = advancements.getProgress(adv);
    if(p.isDone())
      completed.add(res.toString());
  }
  
  String[] completedArr = completed.toArray(new String[0]);
  NetworkHandler.INSTANCE.sendTo(new MessageSyncAdvancements(completedArr, showToast), player);
}

Advancement advAdvancement = manager.getAdvancement(advResource);

Advancement advancement = server.getAdvancementManager().getAdvancement(new ResourceLocation(Wizardry.MODID, "advancements/advancement_crunch.json"));
if (advancement == null) return;
AdvancementProgress progress = ((EntityPlayerMP) entity).getAdvancements().getProgress(advancement);