Here is the full list of all 21 Poop Slinger trophies - there are 21 bronze.
All poop colors have been unlocked
Eliminated 5,000 Citizens
Eliminated 250 Joggers
Eliminated 250 Bikinis
Poop on a Cooler
Poop on a Pig
Poop on a Boom Box
Poop on a Toolbox
Poop on Popcorn
Poop on a Bucket
Poop on a Brown Duck
Poop on a White Duck
Poop on a Chicken
All Slingers have been unlocked
Eliminated 10,000 Citizens
Eliminated 25 Prisoners
Eliminated 25 Robbers
Eliminated 25 Thugs
Eliminated 50 Tourists
Eliminated 50 Hobos
Eliminated 50 Top Hats