I recommend you guys a glitch that really helps to get this achievement and other two.
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Energiser, Claustraphobe are so easy. for the Energiser achievement, just increase your game gamma in options. that really helps. and for the glitch, whenever you've been spotted by an enemy. just keep pushing
and the enemy will be stunned! keep pushing
and t-bag towards the nearest place to escape. you DON'T have to stand completely and then push B to crouch. just smash it.
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NOTE: the enemy will come after you when you stop pushing B, unless you are far away out of his sight. and make sure not to get too close to them while they are stunned. you might get hit or worse.
Good luck guys
Credit to PHub07 for mentioning this. I remember struggling with this myself but I forgot to add it to the guide. Walker(big scary guy) is glitched! If you use this glitch on him make sure you don't stop t-bagging unless there is so much distance and at least a wall between you two. he can grab you and insta-kill you from 40 feet away. DO NOT be in the same room/hallway with him when you stop pressing B.