This achievement is story-related and cannot be missed.
This is the final story achievement. You will have to go to the cinema (beware of all the snipers there. Take them out with silent takedowns). Once inside the last boss fight against Clayface will start. Just evade his attacks by double tapping
and throw freeze bombs at him. There really isn't much more to the fight. Continue doing so when you are a couple of floors below. Having your suit/health for cqc upgraded helps a lot, too.
(video credit: PrinzeAssassin)
Hope this helps you guys!
Any improvements? Please let me know in the comments below