Has anyone been able to get this title? Because at this point in time it seems to be broken

This title is indeed possible:
https://gyazo.com/4c53c8ad422f7d14a9c49d284194c832

Requires you to kill 15 of the QUICK Armadillos - these are separate from the regular Armadillos throughout Mediah.

Only "Quick" counts for this Title
https://imgur.com/Db7OI1N

For anyone else looking for these and trying to get them to spawn - I discovered that going to the spots where they show up, killing all nearby mobs, and waiting for a minute or so seemed to much more consistently cause them to spawn. When they are not spawned, they can sometimes still be seen on the minimap with a brief flicker as you approach before the dot is removed. Tracking armadillos will not cause the minimap icon of these to change, so setting tracking targets for any enemies near the spots you're checking so that the armadillo is the only enemy still red can be helpful scanning for them.