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