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