Full list of all 27 Duke Nukem 3D: 20th Anniversary World Tour achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Find the Doomguy in the Level "Death Row".
Use a cheat code.
Finish the "Hollywood Holocaust" level in under 3 minutes.
Finish any level on "Damn, I'm Good" difficulty.
Complete "Alien World Order" on any difficulty.
Carry all weapons with ammo at once.
Find Sam in "Mirage Barrage".
Burn 50 bad guys to death.
Use the Incinerator
Kill 10 bad guys in 10 seconds while on steroids.
Kill a Firefly Trooper while it's flying small.
Use the hookah in High Times.
Complete "The Birth" on any difficulty.
Complete "Shrapnel City" on any difficulty.
Find 70 secret areas.
Listen to Developer Commentary (Use at least one trigger).
Complete "Lunar Apocalypse" on any difficulty.
Kill 1000 enemies.
Kill 5 bad guys with one shot.
Step in a pile of excrement.
Step on 40 enemies after using the Shrinker on them.
Find Luke in the Level "Lunar Reactor".
Complete "L.A. Meltdown" on any difficulty.
Find any secret level.
Kill every enemy on a level.
Tip an exotic dancer.
Find a secret area.