I got myself all secrets in all stages, using the various guides online. My map says: 116/116. Still, the achievement is greyed out. What did i miss this time round?

I have seen on steam that there was an issue with some update, if I remember correctly, Halloween map has secrets, which you should open too, but they weren't added to max amount of secrets, your real is like 116/119 (don't know amount, 2-3).

Thank you! After pumpkin level, i got it at last!