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