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