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