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