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