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