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The problem is more that there are too many lists rather than too few! IMDb works okay, but the filters there are sometimes annoying and not always reliably updated. I find TheTVDB or MyDramaList better (if you watch Asian series too) - you can sort directly by completion status and you also get info on episode count and exact end date. Wikipedia also has series archive pages for many networks where completed shows are compiled - sometimes that's the quickest solution if you want to search within a specific genre or network.
There are several options depending on how detailed you want it to be. The easiest is probably IMDb - you can just filter by "status: ended" in the search filters and you'll only see completed series. That saves you a lot of time browsing and you can immediately see the number of seasons and when the last episode aired. TheTVDb works similarly and often has even more details about individual seasons.
If you prefer something more community-driven, Trakt is a good place to start. You can check out lists from other users or create your own watchlist with only completed shows. They also have good filters and you can directly see which seasons exist and how long each season is. Reddit communities like r/tipofmytongue or genre-specific subreddits are also great if you're looking more for recommendations of good completed series rather than a complete database.
So it really depends on whether you'd rather search through a huge database or need recommendations from other people. For a quick overview, I'd just start with IMDb and then add the other resources if needed.
Are you looking more for series in a specific language, or do you not care whether they're in English or German?
The most annoying thing about the big platforms is that the filters actually exist, but then expired or paused series still slip through anyway 😅 What's helped me: on Reddit there are actually pretty active communities like r/finishedtvshows or German-language equivalents, where people regularly post their completed favorites. Not as structured as a database, but always up to date and with actual recommendations instead of some algorithm's listings.
If you really need a complete overview, you could also start your own spreadsheet and collect the series there that you want to finish watching - sounds annoying, but then you just filter by your criteria (how long it takes, genre, etc.) and you know exactly where you're at. MyDramaList is another option if you're more into Asian series, the info there is usually more reliable and complete.
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