Such benefits as finally determined shall be a lien upon the land on which they were assessed, which lien shall attach to such land from the time of filing the order and certificate of the Commission with the Town Clerk, provided the same shall not remain a lien thereon for more than six (6) months thereafter, unless appeals are taken therefrom, and the time when papers in such appeal proceedings are returned to the Town Clerk, unless said Commission shall file with the Town Clerk a certificate signed by them describing the premises assessed, the amount assessed, and the work for which the assessment was made, and the Town Clerk shall record such certificate in the land records of the Town.