Complete level 1.
Kill 50 enemies.
Kill 100 enemies.
Kill 250 enemies.
Kill 500 enemies.
Kill 750 enemies.
Preform a Deadly kill combo.
Preform a Cruel kill combo.
Preform a Brutal kill combos.
Preform an UltraViolence kill combo.
Complete level 2.
Complete level 3.
Complete level 4.
Complete level 5.
Complete level 6.
Complete level 7.
Buy any cat upgrade.
Kill 25 enemies.
