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Have a character on your team get their weapon fully upgraded in single player mode. Alternately, have no characters on your team miss during an entire level in single player mode. This option is unlocked at the battle mode team types menu.
Get a 100% hit head shot status two times in a row. This option is unlocked at the battle mode team setup menu.
Get two head shots in a row. This option is unlocked at the battle mode menu.