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