This may come across as not so easy because after all the prior LEGO games where you wished that your AI comrades would help you to defeat the bad guys but were extremely lame at it, in this game they are very good at it making this Trophy seem like a bit of a nightmare but i am here to tell you it is actually easier than you think because yes if it was to be done all in one go it would be a pain when your 3 AI players keep killing them before you get the chance.
This is where the "Save and exit" once again makes the Lego games less hassle than they need to be. Yup that's right, you do not need to get all 10 kills in one go. Instead just load up the level and pick a character that has the flame laser ability like Inferno and kill the enemies that come from the first 2 eggs. As soon as they are all dead hit options, save and exit and then repeat the process until you get the trophy as the count carries over from each time you save and exit
Happy gaming all