I've just managed to get this achievement and yesterday hit a problem. I did my final Elemental fight and got a win then did the magic one which was not the last one. I then checked as I should have had the Elemental achievement, neither of my wins was credited in the achievements. The same thing ha...

Magic Bloodboil can solo it, or almost at worst.

Undead Son of Sethe does the same

Varenne

Critter

Larva Beetle 1,2,1

Lucky Quilen Pup 1,1,1

Lovebird Hatchling 2,2,2

My collection just arrived on beta on a pre-made character.