Here is the full list of all 28 Duke Nukem 3D: 20th Anniversary Edition World Tour trophies - there are 10 bronze, 11 silver, 6 gold and 1 platinum.
Completed all trophies for the game!
Kill 1000 enemies.
Find 70 secret areas.
Kill 5 bad guys with one shot.
Kill 10 bad guys in 10 seconds while on steroids.
Find Sam in "Mirage Barrage".
Find Luke in the Level "Lunar Reactor".
Find the Doomguy in the Level "Death Row".
Kill a Firefly Trooper while it's flying small.
Finish a secret level.
Use the hookah in "High Times".
Kill every enemy on a level.
Burn 50 bad guys to death.
Tip an exotic dancer.
Finish the "Hollywood Holocaust" level in under 3 minutes.
Complete "Alien World Order" on any difficulty.
Complete "The Birth" on any difficulty.
Step in a pile of excrement.
Complete "Shrapnel City" on any difficulty.
Complete "Lunar Apocalypse" on any difficulty.
Use the Incinerator.
Step on 40 enemies after using the Shrinker on them.
Complete "L.A. Meltdown" on any difficulty.
Carry all weapons with ammo at once.
Use a cheat code.
Finish any level on "Damn, I'm Good" difficulty.
Find a secret area.
Listen to Developer Commentary (Use at least one trigger).