SMITE

"As Baba Yaga, gain 50 stacks on your items in a single game, utilising the power from your cabin"

Baba Yaga's cabin follow her around the map at a bit of distance. It gains energy as it moves, when it's close to enemy gods and just generally over time. If you build a stacking item, such as Book of Thoth or Warlocks Staff, when you move near your cabin, you'll automatically have the energy gained turned into stacks on one of your items.

For this achievement, you simply have to gain 50 stacks from your cabin on any items that can stack. You can see how much energy your cabin has by looking at the purple coloured bar that you can see on your passive (the little house icon in the bottoms left of the screen)

This achievement is unlocked by having Baba Yaga's passive The Cabin gain 50 stack on a item in a single game.

Simply buy Mage's or any other Blessing as your first item and the cabin will get the stacks keep walking near it periodically to get them I got this within 2:30 in Arena.

If you stack your blessing with no achievement buy Warlock Staff and Book Of Thoth, then repeat.