Hmmm, okay. Definitely don't click on the last 2 secret ones from the first batch. The first batch in general is spoiler-y, but the last two are really the ones to watch out for the most. Under no circumstances should you click on the second achievement from the second batch of secret ones - seriously. Just don't. The first one from that batch is okay at this point, third one's a maybe, fourth one... hmm, probably shouldn't click on that one either. The last secret achievement from the final batch is also spoilery. The rest secret achievements seem generally okay, though. And the ones that aren't marked as secret are obviously fine, too.