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