Okay, time to try to wrap this up. I'll go through the suggested talismans one by one and post thoughts, taking feedback into account.
* Chill out! - No climbers. This invites very fiddly solutions (see Minim's replay). Namida said he would vote for it, unless we already have a talisman using the same trick (turning lemmings with bashers and diggers only). I think that Across the Gap - 1 builder, while not exactly the same, is pretty closely related. Still, it's interesting that no-climber is possible and it's different enough from the normal solution, so I'm indecisive on this one, which is a great start

Maybe leave this until we have a clearer idea of the numbers.
* Acrophobia - Save 100% or no diggers. Both commenters liked the no diggers talisman, so we'll go with that one.
* Lemmy in the cold, cold ground - No bashers or no miners. Minim preferred no miners, but not for a great reason; namida found them both interesting. I solved no bashers myself during SYCLW; I had another go at it just now and found it pretty easy. Then I tried no miners, and it's also pretty easy. That isn't a bad thing -- we need some bronze talismans -- but it does make it hard to decide between the two options! (Unlike "Going Their Separate Ways" below, we can't combine the two possibilities by having a minimum total skills talisman. Both no bashers and no miners use 10 skills (all 5 builders and 5 of the other destructive skill) while the minimum skills is 6 (a nice balanced 2 of each).
* Going Their Separate Ways - Max 20 skills. As Minim said, this is fairly open as it includes both the no-climbers and the no-floaters solution, so it would be bronze. But I like the idea of that, especially as we don't have any other "max N skills" talismans at the moment. So I'm inclined to include this one.
* Worra load of old blocks - No diggers. Namida points out that this is very fiddly, but Minim likes it. Undecided for now.
* Be more than just a number - Save 100%. I've always liked this solution and I think it's one we should keep. (Minim likes it; namida is neutral.)
* Fix the road, quick - Save 100% with 10 builders. This level gives a lot of leeway, so it's definitely a strong candidate for a 100% talisman, whether or not we add the builders requirement. Minim calls it "a true classic".
* Temple of Love - Save 29. Minim says this is "a great challenge", namida likes it, and it's always been one of my favourite max-saves challenges ever since I first worked it out, so this is definitely going in.
* Save Me - Save 45. This isn't really all that much harder than solving the level; it's not the maximum possible (47 on NL, achieved by a very different method), and doesn't enforce any particular linchpin. It's okay but I'm not wild about it, though Minim and namida both like it.
In summary, after a first look over all the suggested talismans, the following ones are definitely accepted: No justice for the hero, ROCKY ROAD, Steel Block Party, Acrophobia, Going Their Separate Ways, Be more than just a number, Fix the road, quick, Temple of Love.
That's 8 new talismans, which puts us on 42 (if we drop PoP YoR ToP and ROCKY ROAD's "save 100%"). It's a nice number, for reasons completely unrelated to Lemmings

but I don't want to just stop there without giving more consideration to the ones I'm still undecided about. We might have to have another poll

Let's see whether considering the bronze/silver/gold numbers helps. Excluding the two we're considering dropping, the existing numbers are 7/16/11. Of the new ones:
No justice for the hero - Namida suggests silver, which sounds about right.
ROCKY ROAD (2 builders) - Definitely gold. It's harder than the existing "save 100%" talisman.
Steel Block Party - Both commenters suggested gold, and it is indeed a tricky challenge, so I'm okay with that.
Acrophobia - Most likely silver?
Going Their Separate Ways - Almost certainly bronze.
Be more than just a number - Minim suggests gold and namida suggests bronze

Maybe we should split the difference?
Fix the road, quick - Silver seems right for this.
Temple of Love - Minim suggests gold, namida silver. Personally I think it could be gold.
So, that would put us at 8/20/14.
As for where the undecided ones would go... Chill out! could be silver or gold; Lemmy in the cold, cold ground is definitely bronze (whichever of the two we choose); Worra load of old blocks most likely gold; Save Me could be bronze or silver.
Okay, I think I see what to do, but this is a long post already so I'll put it in another post.