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