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