Left 4 Dead 2 developer Valve Software has revealed the achievements due to be added to the zombie apocalypse shooter by its upcoming downloadable content 'The Passing,' which neatly teases some of the multiple new game modes that it'll deliver.

One achievement involves "Cache Grab," which Valve describes as involving new foot lockers, while another is awarded for playing 6 mysterious "Mutations." Valve offers no explantation of what Mutations are, instead promising to reveal them tomorrow.

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