I DONT WANT TO SPOIL ANYONE SO DONT READ IF YOU DONT HAVE PLAYED THE GAME. :)
You will get this achievement just by playing throught the campaign.
After finishing the DNA Sequence 5, you will came out of the Anymus. There will be a scenematic telling you what you will have to do. Basically you have to climb to the very very top of the tower and jump off and deploy your parachute by pressing on any button.
In the video i'll show you where you start and where you have to jump to get your achievement.