Okay, let's give this a crack:

20. Swort Art Online

Watched the entirety of Season 1 and GGO in Season 2.

19. A Ghibli film

I think I've seen damn near all of them.

18. A non Ghibli film that is not Akira or Ghost in the Shell

Outside of the movie installments of various tv anime I've seen, I've also seen A Silent Voice, Castle Cagliostro, Paprika, Perfect Blue, Redline, and the various works of Mamoru Hosoda and Makoto Shinkai,

17. An old anime

The oldest anime I've watched was the OG Mobile Suit Gundam.

16. Shirobako

Yep, did a watch of it last year.

15. The nostalgic shows you watched as a kid.

A few years ago I did do a rewatch a few of the digimon series, so I can check this off.

14. A hentai.

I've watched quite a few ecchi series, but I honestly can say I have watched any straight up porn yet.

13. Legend of the Galactic heroes.

This is on my "too watch" list. Once Hidive gets all the episodes up on their service, I might check it out one day.

12. An anime where you argue over best girl

Most recently, Tsuredure Children

11. Something with boobies

I mean,

10. The one hot anime that everyone is watching every season

I actually sat out on Made in Abyss last season but recently watched it and loved it. I did watch Kakegurui as it aired and this season I'm on the Inuyashiki hype train.

10.5 The 50 anime you pick up every season and then drop after three episodes

Naw fam.

9. Avatar the last airbender.

Absolutely. My all time favorite Western Cartoon.

8. Boku no Pico and Cory in the House

Yes to Cory in the House, no to that first thing.

7. Gundam

I did a big marathon of franchise last year. I've majority of the UC, Wing, and Iron Blooded Orphans. I still need to finish Victory Gundam, and G Gundam will follow after.

6. Cowboy Bebop

Funny story, for as long as it aired on Adult Swim, I've only ever seen a couple of episodes here or there. It wasn't until last year that I finally sat down and watched the entirety of the series.

5. Attack on Fullmetal Death Note Punch Man

Seen them all. FMA: Brotherhood is my all time fave.

4. Episode 3 of Madoka Magica

Funny story here, I definitely got spoiled on this prior to watching but somehow forgot about the spoiler when I actually finally got around to watching the series.

3. A highschool anime Plenty.

Quite a few, ReLife is probably my favorite.

2. Neon Genesis Evangelion

I've watched it twice, back when it was on Adult Swim and I was in Middle School, and once more when I started college.

1. Your favourite anime that didn’t make this list.

Stuff like Welcome to the NHK, Barakamon, Samurai Champloo

So 18.5 I guess.