ACHIEVEMENT - HOW TO UNLOCK Bee - Complete the game using only the pulse laser on Normal or Hard. Beetle - Complete a boss using only the pulse laser on Normal or Hard. Boom! - Kill 20 or more enemies in one shot with the Zorlon Cannon. Cloned - Complete every level in Co-Op Mode. Cockroach - Complete the game without dying on Normal or Hard. Gnat - Complete a level without taking damage on Normal or Hard. Hardcore - Complete all levels in Hardcore Mode. Mosquito - Kill (1000) enemies with missiles. Multiple-Madness - Get your multiplier above 100 on Normal or Hard. Reaper - Complete a level in Hardcore Mode without dying. Wasp - Kill (500) enemies with the railgun. Yars' Revenge - Defeated Queen Raktamalina.