I ask as "Kloro Completist" is eluding me. I have a check by all 20 streets on /locations/kloro/ but I have not received the Kloro Completist achievement. I just tried revisiting all 20 streets and then verified that the /locations/ page for each street says I have been there at least twice.
If there is indeed a secret/hidden location, no need to tell me exactly where it is, please; a "You should explore a bit more" will suffice. :D
Thanks in advance!