There rather big difference on the raid achievements. Think it would be nice if a dev would take a look at them and change so they became more even How many have done the vortex one? Imo this is 1 that would be good as individuel instead raid. And vp 3 could be harder.
Honestly with the rewards being ornaments I don't know if that many are even trying to get them. Would be interesting to see who all are actually working to complete them.
Triton has also finished all of them. Sudden Death and Vortexless were the last 2 we got. They're a pita but doable.