Hello! I've been using Badges for a long time, so I want to share my thoughts. I hope my ideas will seem interesting and reasonable to the community.
Firstly, achievements by genre:
I like the layout of levels 1 to 6.
1 lvl - 10 titles - 50 points
6 lvl - 100 titles - 1500 points.
I think that's fair.
So why such a biased attitude towards achievements CGDCT, Iyashikei, Mythology? In order to get level 1 of these achievements, fewer titles are required. While for level 6 it is much more than for other genres. For the final level you need to watch almost all the anime from the MAL database. I think they should be put on par with other genres. It is possible to add level 7 with a threshold of 150 titles, but it costs more to gain points for this. For example 2000.
If somewhere levels more than 6 are needed, then these are genres with a large number of titles.

For such genres something like this is just right:
7 lvl - 150 titles - 2000 points.
8 lvl - 200 titles - 3000 points.
9 lvl - 300 titles - 5000 points.
I consider this situation to be balanced.
Also a strange attitude towards the genre Isekai. This genre is not as wide as Harem,Space, School, Romance. So why is it only expanded to level 9? At the same time, the difference between levels 8 and 9 is only 25 titles, but for level 9 a whole 1000 points are added. I think the same thing applies to him as I suggest for other genres: level 7 - 150 titles - 2000 points.
You can also expand the achievement Shounen.
Next, achievements by year:
I believe that there is no need to make such significant achievements for old anime.
197х, 196х should be limited to level 7 with 1500 points for 150 titles
195х, 193х ok
194x 500 points for 32 titles. I don’t understand why they award 1500 points for such a small number of short anime.
As for new anime, the gradation there is also very good from the very beginning.
5 lvl - 50 titles - 1000 points. Why not? It is perfectly!
But I don't think 2019 was anything remarkable. Why are fewer points awarded for 50 titles starting in 2019?
If the community feels that there are too many anime coming out lately (but this started much earlier than 2019), then why not just add further levels of this achievement?
6 lvl - 75 titles - 1250 points
7 lvl - 100 titles - 1500 points
It seems to me that this will be fair, and it can be extended to earlier years, until 2012-2014.
And finally, I want to add that in terms of the number of episodes, everything should also be changed. I see that you are thinking about this. I just want to add from myself: for watching with a large number of episodes it is worth adding more points than for anime with 1-25 episodes. It’s somehow strange to award only 1500 points for 100 anime with 100+ episodes.
All of the above are just my thoughts. I am grateful to those who are working on this project. English is not my native language, so if I wrote some sentence too unclearly, then I apologize.