This achievement is unlocked naturally as the story progresses. If you would like to know the exact time, please read on.
*** Spoiler - click to reveal ***This achievement comes after Strange commences with Protocol 10 and you make your way up Wonder Tower to stop him. After he is "dealt with" Strange will turn on a self-destruct before he bites the dust and you jump out just in time and land safely because that's just what Batman does. Achievement unlocked.
It is also good to note that after this achievement you have to head off to the final fight immediately, so don't dilly dally.