This achievement is story related, so just keep playing to unlock it.
*** Spoiler - click to reveal ***When you are attempting to free Jade at the museum, things actually get bad. You end up in a fight with Tahir, one of Rais' most important men. You have to fight him with a melee weapon. First things first, turn on your flashlight so can see as much as you can, because the area you're in will be pretty dark. Tahir is actually quite fast, so try to avoid damage by dodging away. He also throws knifes here and then, so watch out. Try to hit him once or twice from behind when he just took a swing at you. During the fight, once you've take about half of Tahir's life, there will be 4 other enemies that will attack you so try dealing with them first. Use the environment to take cover, so they can't corner you all together. Once you finally defeat Tahir, a cut scene will begin. After that, the achievement will pop.