Question

why was the Ancient Mariner made to carry the dead albatross around his neck

Answer 1

He has to made to carry the dead albatross around his neck because he only is the reason for bad luck and killing of albatross led to this.

Answer 2

It was the thoughtless and reckless action of the mariner that had brought them only suffering.As a punishment they hang the Albatross around the neck of the Ancient Mariner which was constantly remind him of his heinous act and make him feel guilty.