Taking Out the Trash

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Defeat a certain number of enemies with heavy attacks, lock-on fire, or both.

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This requires 300 kills.

Heavy attacks hit all those in a close meter radius, but overheats asura for a while, whilst lock on fire attacks are used by moving the crosshairs over targets to lock on in shooting sections, then fires lock on attacks at the selected targets. They are both activated with Y But. To make this easier, use only lock on fire in the shooting sections, and heavy attacks when enemies are many in the normal sections (unlimited mode makes heavy attacks easier by removing the cooldown procedure). Do it like this and you should have unlocked it by chapter 10.