mrmBot-Matrix/commands/mc.js

const fetch = require("node-fetch");

exports.run = async (message, args) => {
  if (args.length === 0) return `${message.author.mention}, you need to provide some text to generate a Minecraft achievement!`;
  message.channel.sendTyping();
  const request = await fetch(`https://www.minecraftskinstealer.com/achievement/a.php?i=13&h=Achievement+get%21&t=${encodeURIComponent(args.join("+"))}`);
  const buffer = await request.buffer();
  return message.channel.createMessage("", {
    file: buffer,
    name: "mc.png"
  });
};

exports.aliases = ["ach", "achievement", "minecraft"];