Achievements help

[ecureuilcity]

I still have one achievement unlocked, it's named "Stop That! (watch your back)".
Idk what to do with it, maybe it's related to music and/or Mary (because of the ingame picture of the achievement... I tried a lot of things but nothing conclusive for now.

If someone could help me with a hint? Please?

[ecureuilcity]

Still looking for help with the achievements Please

Dev came to the forum and didn't even bother answer me, so ... thank you dev ... I guess ...

[ecureuilcity]

Still no one to help me with this achievement ? Pretty Please