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.
Use a cheat code.
Complete "Alien World Order" on any difficulty.
Carry all weapons with ammo at once.
Find Sam in "Mirage Barrage".
Use the Incinerator
Burn 50 bad guys to death.
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.
Step on 40 enemies after using the Shrinker on them.
Kill 1000 enemies.
Listen to Developer Commentary (Use at least one trigger).
Complete "Lunar Apocalypse" on any difficulty.
Find any secret level.
Find Luke in the Level "Lunar Reactor".
Finish the "Hollywood Holocaust" level in under 3 minutes.
Step in a pile of excrement.
Complete "L.A. Meltdown" on any difficulty.
Kill every enemy on a level.
Find 70 secret areas.
Kill 10 bad guys in 10 seconds while on steroids.
Find the Doomguy in the Level "Death Row".
Tip an exotic dancer.
Finish any level on "Damn, I'm Good" difficulty.
Kill 5 bad guys with one shot.
Find a secret area.