Helmet
Located in Colbys Movieland at the gift shop (Picture below).


Body
Kill 10 psychopaths and beat the game. (Punisher achievement)


Boots
Dont get captured (killed) by the special forces or the cultist either on 72 hour mode or overtime mode and get an ending. (Unbreakable achievement)


Mega Buster
Either get the toy version at Colbys Movieland or the real one by unlocking the Zombie Genocider achievement and get an ending.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=763924797 Use this guide if you wanna go for the real mega buster




and thats it! Best dead rising outfit ever