Very simple achievement. You won't be able to access your augmentations or earned praxis point until after you've completed the mission Getting In Top Shape Again. Once this is over you will have a number of enhancements to choose from, and the silver coloured experimental ones will be explained to you. After the tutorial simply buy the first level of any of these for 2 praxis points and the achievement will pop. You could save just before and reload if you don't want to put anything in to them just yet.