grind 13000 coins first by going to mechanic , buy all the items from caterpillar , give stone and bat juice to succubus, fix the part by combining metal piece with copper wire and give it to the mechanic , go to the pool use wrench on the tap , and use the shining chain near pool , go in pool , come again after 3-4 days , use pool and again after 3-4 days , i have 100% achievement so telling you that. enjoy:)