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