Increase Nanotech to 50

Complete the Beat School level.

In Shangri-La, dispose of a Napalm zombie without it harming any players.

Complete all 40 of the Catwoman Riddler grid items

In Moon, acquire 3 pack-a-punched weapons at the same time.

Use every type of novelty weapon on a zombie

Get started with this simple bass loop!

Kill all enemies without leaving the dance floor in the city outskirts

Got rid of a ghost for the first time.

Get an online form of 25 or better.

Unlocked all soldiers in multiplayer

Completed Chapter 1 of Episode 4.