I cant get General Relativity Planetary Orbit

Is anyone else having no luck getting this achievement or is it just me? Nothing I'm doing is working.

so when black hole absorbs star and gets that rim, is it basically supposed to look like saturns ring but strong gravity distortion pulls light from behind black hole causing single rim to look like 4 rims sametime? so like u can see one line going across black hole sameway saturns dose, but then theres also glowing light of rings around black hole as well, but they arent actually there and are just main rim split into two by distortion? second question is, what is difference between newtons gravity and g...

One issue I have with this game is that steam randomly decides when this game does and doesn't have achievements and it constantly disappears/reappears from my 100% complete list.