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