The Kin to __ achievements CAN include spells and items. As long as all of the creatures are of the color the rest of the cards don't matter. I've tried this twice with a green and a red deck to 10,000 and it works regardless of spells/items.
The rest of the guide is great so far though.
1000s - COD4, Soulcalibur IV, Halo 3