if(isset($error) && isset($_SESSION['id'])){           
                    $bad = 1;    
         $error .= 'Вы уже авторизованы!<br>';       
}

CREATE TABLE IF NOT EXISTS `achievement` (
    `acId` int(11) NOT NULL AUTO_INCREMENT,
    `acName` varchar(50) NOT NULL,
    `acDesc` varchar(100) DEFAULT NULL,
    `acPicture` varchar(100) NOT NULL,
    PRIMARY KEY (`acId`)
);

CREATE TABLE IF NOT EXISTS `user` (
    `userId` int(11) NOT NULL AUTO_INCREMENT,
    `name` varchar(40) NOT NULL,
    PRIMARY KEY (`userId`)
);

CREATE TABLE IF NOT EXISTS `userachievement` (
    `userId` int(11) NOT NULL,
    `acId` int(11) NOT NULL
);

CREATE TABLE IF NOT EXISTS `achievementLog` (
    `userId` int(11) NOT NULL ,
    `acId` int(11) NOT NULL,
    `count` int(6) NOT NULL DEFAULT 0
);

$query="INSERT INTO 'table'  (`name`,`pass`) VALUES ('Nick','123')";

$query="INSERT INTO `table`  (`name`,`pass`) VALUES ('Nick','123')";