Complete the Beat School level.

Complete all Campaign levels.

Kill 50 Chimera by detonating their heatstacks in the Single Player Campaign

Successfully complete level 6

Kill the Leviathan

Kill 100 Chimera with headshots in the Single Player Campaign

Kill 50 Chimera with Riley's axe in the Single Player Campaign

Successfully complete level 5

Use the secondary fire of each weapon in the Single Player Campaign

Kill 500 Chimera in the Single Player Campaign

Kill an Impaler

Kill 250 Chimera in the Single Player Campaign

Kill the Abomination