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