Avatar: The Last Airbender (ATLA) 1080p Fan Remaster is a widely acclaimed community-driven project created to fix the visual issues found in the original DVD releases. Project Overview
As of now, there is no official confirmation from Nickelodeon or the creators of ATLA regarding a remastered version in 1080p. However, various fan-made remasters and upscaled versions have been shared online. These unofficial versions aim to enhance the visual quality of the original series, making it more enjoyable for fans. atla remastered in 1080p link
The Avatar: The Last Airbender: The Complete Series Blu-ray is widely considered the best official way to own the show, as it provides the highest bitrate and consistent 1080p quality. Avatar: The Last Airbender (ATLA) 1080p Fan Remaster