Unlocks the achievement.


        :param bool store: Whether to send data to server immediately (as to get overlay notification).
        :rtype: bool

def unlock(self, store=True):
        """Unlocks the achievement.


        :param bool store: Whether to send data to server immediately (as to get overlay notification).
        :rtype: bool

        """
        result = self._iface.ach_unlock(self.name)
        result and store and self._store()
        return result