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