Needs More Chainsaw is an achievement/trophy in Dead Rising 2.
It is unlocked by creating a Combo Weapon It can be any of the 49 Combo Weapons available throughout the game.
You do not need the Combo Card for the weapon for it to count towards the achievement.
- After getting the Maintenance Room Key from Sullivan make a Spiked Bat in the Maintenance Room outside the Safe House. The materials are in the Maintenance Room.
- The name of this achievement is a reference to a Saturday Night Live skit written by Will Ferrell where a man played by Christopher Walken repeatedly tells the band, Blue Öyster Cult, that the song "Don't Fear the Reaper" "needs more cowbell."