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