Originally Posted by Syrinx
6. VERY IMPORTANT, DON'T LET THE ENEMIES BLOW UP ANY "Fire Extinguishers" OR "Canisters" AS THIS WILL STOP THE ACIENEMENT FROM POPPING UP.
Not necessarily true. I got detected on the second part of the level and enemies threw multiple grenades and exploded several objects (canisters, tanks, fire extinguishers) and I still got the achievement at the very end.
Also, to those are still attempting this achievement and/or reading this thread, you can always use the retry button and still get the achievement without loading to the title screen and back and enduring a long wait.