Choose augmentations based on your play style, and get the ones that will benefit you the most.
Augmentation
How to unlock
Cranium
Capture is the most important, as you must be able to hack successfully. Do not waste points on Social Enhancer, Hacking Stealth, or Fortify.
Skin
Invest in the cloaking upgrade to keep your character invisible as long as possible.
Arms
Heavy Lifting will help open doors and move crates.
Torso
A faster recharge lets you use your special skills more often.
Eyes
Upgrade the radar and get the augmentation to see through walls if you have the points.
Legs
Being able to run silently is very useful, especially when you have enough energy to combine it with cloaking.
Easy "Bargain Hunter" achievement
Select the following phrases in order: "Direct", "Alternative", "More info", "Request", "Take it", "Free".
Easy "Spilling the Beans" achievement
Select the following phrases in order: "Appease", "Direct", "Deflect", "Bait".
Easy "Starting Off On the Right Foot" achievement
The first three kills in the tutorial are not counted. Use non-lethal takedowns for every enemy once takedowns are unlocked a short time into the tutorial.
Hacking
Avoid hacking until after you have thoroughly explored the surrounding area for an alternate route or key.
Stealth
Stay under cover and crouch whenever possible to become invisible to enemies. The objects highlighted in orange are those that can be used as cover. Roll from cover to cover to surprise your enemies and stealthily eliminate them. When you are outnumbered or low on ammunition, use a stealthily approach. Eliminate your enemies silently using the stun takedown. Use the radar to learn if you have been spotted and when enemies are in a position to be eliminated quietly. The best time to do this is when they are as far away from others.
Augmentations...