function Achievement(name, property, value, text, points){
  this.name = name;
  this.property = property;
  this.value = value;
  this.text = text;
}

achievements.push(new Achievement("Clicktastic", &numClicks, 1000, "You clicked 1000 times!");

for (var i = 0; i < achievements.length; i++){
  if (*achievements[i].property >= achievements[i].value){
    //deal with earning achievement
  }
}