Dead Rising 2 - Head Trauma Achievement

Use every type of melee weapon on a zombie

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You will need to use every type of melee weapon to get this achievement. You will get these weapons certain ways.

How to get:

Giant Pink Chainsaw - 'Here Comes The Groom' side mission
Katana - Case 4-1
Magician's sword - 'The World's Most Dangerous Trick' side mission
Military Case - Starting from Case 5, hard to miss boxes though.
Trophy - 'Two for Company' side mission

You must get each of these to get this achievement, once you have used each you should get the achievement.