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