Well... just to clarify who will still try for this achievo:
Someone start a new game... and you join.
You need to go castle > city > mini boss (to get your second sphere orb) > city > castle... stop near the save point. Equip some armor and block itens, REMOVE ALL itens that has stats RETRIBUTION, SAVE here go down the stairs.
when you enter the room with spiders just HOLD
and keep pressing
(
+
), do this from 100-200 times. And you will be able to empower
+
+
.
I was able to do this when i made around 160
+
.
My friend got with 115, so its random. it takes around 30-60min.
Thats it.