public void act() {

        // Checks if the bird flaps.
        checkFlap();
        // Moves the bird.
        move();
        // Checks if the bird hits the obstacles.
        if (checkHit()) {
            Sky sky = (Sky) getWorld();
            sky.gameOver(score);
        } else {
            // Checks if the bird gets ths score.
            checkScore();
        }
        Sky sky = new Sky();
        AchievementOne achievementOne = new AchievementOne();
        if(this.intersects(achievementOne)){
            sky.adddies();
            sky.ahievement();
            System.out.println("pass");
        }
    }

 int dies = 0;
    Boolean menue=false;
    /**
     * Constructor for objects of class Sky.
     * 
     */
    public Sky() {
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1);
        addObject(new Bird(), getWidth() / 2, getHeight() / 2);
        scoreBoard = new ScoreBoard();
        addObject(scoreBoard, 70, 50);
        pipeTimer = PIPE_INTERVAL * 2;
        setPaintOrder(GameOver.class, ScoreBoard.class, Bird.class, Pipe.class);
        Greenfoot.playSound("sounds/background.mp3");
    }
    //The 2 blocks of code are for the 'Die after 10 pillars' achievement.
    public void adddies()  
    {  
        dies++;  
    }  

    public void ahievement()  
    {  
        if(dies>2&&menue==true)  
        {  
            addObject(new AchievementOne(),100,100);  
        }  
    }  

    /**
     * Things to do for each turn.
     * 
     */
    public void act() {
        // Adds a pipe pair periodically.
        addPipePairPeriodically();
        Greenfoot.setSpeed(40);
        adddies();
        ahievement();
    }

    /**