Dungeons 3

This is done in the "The End of Burgers' End" level. In this level you're required to destroy food deliveries to prevent the "fat" Heroes from continuing to bulk up. There are a total of 12 deliveries with 3 different paths the deliveries can take. The earlier deliveries will come in 1 or 2 slow unescorted convoys but the later ones will be fast, have escorts and will have 2-3 deliveries come via 3 possible paths. The paths are fixed but which paths are used are randomly selected so you need to intercept them early, otherwise you might not be able to catch up to them.

Killing the donkey in a food convoy is all that is needed and you need to kill all 12 donkeys for the trophy.