Hello ATT Team,
I just came across this mismatch in ATT. ATT claims I've completed all necessary steps for the achievment, but WoW says no:

ATT does recognize "Mawswarm Shackles" are also missing in my char, but it lists it only as Zone drop, not as required for the Achievement.

I'm using the latest Alpha Version from Curseforge 2.3.3-108

Please let me know if you need any additional information to understand this issue.

Kind regards,
Loradim

I'm not 100% sure but I think it was intentional. Initially, this achievement listed all criteria (in the Outdoor content->SL->Maw->Achievements) but then we moved criteria to more "appropriate" places but not all of them as you can see.
This achievement has all criteria listed under Achievements->Exploration->SL (it's basically a mirror of in-game Achievements in most cases), but it was left in Outdoor zones for more visibility.

Another contrib said:

yeah, most of the maw crit are like "drops randomly from any mob in the zone haha good luck!!" but there are a few from specific sources that are easier to see where they actually come from

So I'll take the liberty to close this.