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Attack an enemy to save your partner who is grappling with that enemy.

Complete the factory.

Complete the laboratory.

Defeat 16 bats in the church.

Complete the training facility.

Defeat Mimicry Marcus with a Molotov Cocktail or a Napalm Grenade.

Combine every type of herb with each other.

Shoot down a Hunter or an Eliminator while they are jump attacking in the air.

Try to push something heavy with Rebecca.

Destroy a zombie's legs.

Complete the train.

Break free of a Cerberus while they are biting you or trying to push you down.