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