Legendary Crafting for an achievement is impossible (S8)

Hello, I would like to understand how these two things are anywhere close to being similar or comparable.

1 legendary ring/amulet cache: 5 forgotten souls, 100000 gems fragments (I can make 0 for the foreseable future)
1 legendary cache: 200 rawhides, 200 iron chunks, 200 veiled crystals and 5 Forgotten Souls (I can make 20 right now).

  • The caches drop exactly the same amount of items - and they are both useless, would be ok if they gave Ancestral 80%+ of times, but maybe not even in that case
  • Obols vendor is a thing!
  • At T3 with 165 paragon and MANY 10 waves of Infernal Hordes + Tribute Gems runs and I am not even close to 1 grand gem

If they are to be the same effort (which they should be) they might ask for 5000 fragments each, not 100000. This difference makes the T3 achievement absolutely impossible.