As for all other Telltale games with more than one version in the series, you can import your choices from the previous version, or choose to go with default options.
As all achievements, this achievement is story related, No need for a guide if you don't like spoilers.
*** Spoiler - click to reveal ***
You will start off with a little update on what the city is like. You will soon learn about Mori, an arms dealer. You will need to gather intel in the casino. Hack into his phone to learn more about him.
Soon things will get dirty. Defeat the guy following you and gear up. Before going in, you will need to scan the surroundings. There are 4 things you can examine, the riddler and the cage with Mori (both left hand side), the hostages and the cashier boot (both on the right top hand side). After I investigated the Cashier boot I was ready for entry. Distract the guard and a lot of fighting will occur now, all with QTE's (including new ones where you can choose either Q or E to choose an approach.
Keep in contact with Gordon, thereby either let them do a frontal assault or using tear gas.
Eventually you will need to free Mori. The weak spot was on the bottom right for me.
The riddler will escape, and Waller will enter killing the last of Ridller's henchman.