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