The Amazing Spider-Man 2

The first opportunity you get to do this is in part of the main story.

In mission 6 you will get to a point where you photograph some bad guys, follow a truck and then enter a hideout.

This is where you start the hideout, and as such, you need to take down the bad guys stealthily without being detected.

Enter the train and walk forward. A bad guy has his back to you so is an easy first take down (LB when he glows purple). Next use B to web goo the flying drone ahead of you.

Now hide behind the boxes on your right and use Spidey sense (up on D pad) to see the image of a bad guy walking towards you on the left. Wait until he turns around then move left and LB him.

Get behind the boxes again and to your right are two guys that stand next to each other, then one walks away. Wait until the guy who walks away gets to the end and stops. Move right out from behind the boxes and you can walk up behind him and hit LB. the other guy on the right stands still so you can now walk up behind him and hit LB.

From there using Spidey sense you can see a guy below you. From the last guy you webbed up walk forward and you can just drop down behind him, and then push LB again.

1 to go so again just use Y to crawl up the wall get behind him and LB - job done. Now approach the suit and when the cut scene starts the achievement unlocks.

If you get spotted at any point, just click restart - it will still unlock as long as on your actual go you do it stealthily.

Last point to note is that there are other hideouts to do this on (during free play) so if you missed this achievement at this point, you do have other opportunities to get it.

Good luck!!