Wear all masks at least once

Use all guns at least once

Clear Chapter 2 using Nigel the Bat

Solve the Puzzle

Kill the panthers using Brandon the Panther

Use all throwing weapons at least once

Kill 30 players with an assault rifle and/or a sniper rifle from over 100 meters away.

Throw a weapon at an enemy so that his weapon hits another

Beat the epilogue

Get an A+ on any chapter

Perform a 10x combo

Kill 1989 enemies

Kill 99 dogs