Spirit Hunters: Infinite Horde

There is specific nodes you need to reach on the Divinity Web to get to the pet unlocks. The first few pets are easy to get to, but others will require quite a bit of grinding. You will need to complete the whole Divinity Web eventually for a separate achievement so getting to the 20 pet nodes will come with progression. You will need a lot of all 4 materials to get to them and unlock them. Runes, Crystals, Ember Cores, and Shadow Souls.