Ginger: Beyond the Crystal

There are 4 types of enemy in Bleepside Lake:

Green Rabbits
Red Aliens
Yellow Aliens
Yellow Aliens with chest pieces

The yellow aliens will spawn constantly in the hub and the red aliens are found within every level. The bunny can be found easily in the desert area of the hub, and will pop out of holes in the ground to try to shoot you. The yellow aliens with chest pieces that fire projectiles at you only appear in the final boss level, the boss actually kills some of them for you which count towards this trophy if you didn't kill any of them earlier.