As you leave the convention centre after talking to Taggart, Nicholas will start talking to you as you pass by him. Talk to him and accept his side mission on finding a rogue bomb and it's owner Jacob White.
From here head to the sewers until you find out where Jacob and the bomb are situated. Knock Jacob out, then head over to the bomb which is near him. Instead of hacking it input the code '0000'. Doing so will unlock the 'Lucky Guess' achievement.
Now return to Nicky and hand in the mission to unlock the following achievement.
the guy on the video in the Guide really doesn't like XP - when you hack a computer, if you can take the red tower it gives you everything, and in cases like the one he did, it's a shorter hack route... also, a hand-to-hand take down gives lots more XP than shooting someone with the stun gun (especially if you hand-to-hand everyone)
@7 "would like to watch a detailed Achievement Guide on how to successfully get this" - Detailed is far from it, you cut chunks out and kill Jacob when you shouldn't. If you're dedicated to doing achievement guides, stop, you suck.
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