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