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