TY the Tasmanian Tiger

Basically, defeat every variation of enemies in the game, and this achievement is yours. You should get this during your quest to finish all of the Zones (the main game), so this isn't an achievement to stress over. I completed the game and still did not get it due to missing the kill on the teleporting enemy which can be found near the end of the first danger area minigame. Simply load up the game, find him teleporting near the ice wall near the end, destroy the wall with a fire rang, then switch to the ice rang and hit him with it, killing him.