Is there a comprehensive list of non-light novels made into Anime?
Anime database sites like MyAnimeList, AniList, Anime-Planet, etc. have a "Source:" field, which indicates the type of medium that the anime was adapted from (if any).

Fortunately for your use case, these sites do appear to distinguish between "Novel" and "Light Novel". For example, AniList's entry for Morbito lists it as "Source: Novel". Meanwhile, entries for anime that were adapated from light novels, such as Toaru Majutsu no Index, display "Source: Light Novel".

So, to get a comprehensive list of anime adapted from non-light novels, searching on these sites and filtering based on source criteria should get you what you want. For example:


AniList search: https://anilist.co/search/anime?source=NOVEL
Anime-Planet search: https://www.anime-planet.com/anime/tags/based-on-a-novel