Professional Superhero Achievement
Complete the campaign on Supersoldier difficulty
This difficulty isn't too bad. It is recommended to do it as your second playthrough, as you will have unlocked the module upgrades, making the game even easier, and you can focus on some other achievements as well. Regardless, for this difficulty, you'll want to avoid as many enemies as possible, by using cloak and running through the levels when possible. In some cases, you will need to complete harder sections, but keep at it, and use your armour and cloak abilities wisely, and try your best to adjust your nanosuit to the scenario.
Avoid the Glitch This achievement is known to occasionally glitch. Make sure you start a new Supersolider playthrough and play the tutorial. After defeating the large boss at the end of the final level, before the ship section, you'll want to create a save file onto a USB Stick or Cloud. Make sure to save the Save File AND Crysis 3 Content Cache File. Keep reloading this save, and finishing the game until the achievement unlocks. If you've tried this a few times, and have been unsuccessful, try deleting the installed game from your HDD.
There is a video to avoid this that can be found HERE.