Here is the full list of all 21 Party Hard trophies - there are 21 bronze. It takes around 8-10 hours to unlock all of the trophies on PlayStation 4.
Complete the game
Kill 50 people by horse
Poison 100 people
Kill 1000 people
Complete level in 3 minutes
Kill 50 stunned people
Use traps 50 times
Kill 30 people without alarm in one level
Kill 20 people in a row
Get you ass kicked for dancing
Play Party Hard 100 times
Hide 50 bodies
Pass level without traps 3 times
Escape cop 5 times
Die 100 times
Kill person who runs to call police 20 times
Kill all robbers in Casino level
Lose level with 1 alive person
Kill 15 people with one car
Complete level with FBI
Complete level without found body