Lucky Guess

 is an achievement in Deus Ex: Human Revolution.

Walkthrough
During the side-quest "Smash the State", which you get after convincing Taggart to give you Sandoval's location, you simply have to guess the code (which is 0000) to disarm the bomb instead of hacking it. Also if you have pre-ordered the game and use automatic hacking tool to defuse the bomb you unlock this achievement.

Also if you have unlocked Icarus landing system, you can climb the ladder next to the bomb and perform stun ( by clicking and holding left mouse key pressed) to disable it.