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