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