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