Battle: Los Angeles

Simply take your time and let your health regenerate if you see the screen turning too gray. It's an easy achievement if you are not impatient. I did it on the 2nd mission but any mission works fine.

This achievement requires you to complete a level without dying, failing, restarting, or continuing on the Normal difficulty.

You must play an entire level in one sitting without stopping the session with death or checkpoint restart, etc... It doesn't matter what mission you choose to attempt this on, all of them are roughly 10-20 minutes long, and equally easy to accomplish. I would recommend, however, attempting this on the first mission, as it is both the tutorial level and intro level to the game. There are plenty of enemies, but if you manage your aim will (Enable Auto-Aim in the options menu) and use cover as often as you can, you will earn this achievement without any trouble. Most experienced FPS players will probably earn this their first try.

The achievement should pop at the end of the level you successfully completed without you having died, failed, restarted, or continued.

EDIT: Might add you need to choose start new campaign. Cannot choose a previously played checkpoint.
(thanks Kennyannydenny)

Message me with any questions.

Note: This achievement must be done on Normal

This achievement is really easy. You can do it on any mission, but try to do it on the first mission so you can get it out of your way. If you don't get it on the first mission, then try on the second or third. Don't bother restarting the mission because you will probably get the achievement on 1 of the 3 missions. The missions are relatively short so you should have no problem with this.


Tips

-Do NOT rush towards the enemies. Stay far back and behind cover. Use crouch to stay low behind cover and pop out when you are not injured to shoot enemies.

-Avoid hiding behind cars because they can blow up. If you need to hide behind a car, make sure it is not on fire.

-Try to go for head shots or torso shots

-When you are injured, hide behind cover until you are fully healed. To be on the safe side, hide behind cover BEFORE your screen goes black and white with read around the screen. This means that you are near death.

-When fighting the Alien Air Units with the Rocket Launcher, there is a good strategy to kill them faster. Right as they start charging their shot, shoot your rocket launcher at them. Reload and shoot again quickly as possible. You can sometimes get 2 shots off before waiting for them to charge again which makes the process go by twice as fast

-You can make the game even easier by turning Aim Assist "On". Go to Help & Options, then Settings, then Game Settings to turn on Aim Assist. Make sure you click to accept. This will make sniping much easier too. An effective way to cover Nants when ever you need to.