Trophies ID .png dimension size

Hi,

sorry for the confusing topic title.

Does anyone knows how to find the ID of a trophy ? And the numbers .png relative to it ? (ex: 7677478.png)

I have already a big pack of trophies but some are missing. I try to create myself the trophy but I don't know which dimension the picture have to be + ID + .png relative number.

My problem is concerning FNL Russian, and lower. (it's 2d and 3d division)

thx a lot