This achievement is missable, but you can unlock it pretty early in the game, or if you missed that location in the last big fighting location (Joker shrine, the fight with the Titan enemy).
For this achievement, you need to perform all of Robin's moves in a single fight. It does not have to happen in the same combo, though.
The moves you need to perform are:
-LT - Quickfire Shuriken
- LT+ X - Quickfire Explosive Gel
- LT+ Y - Quickfire Zip Kick
- RT+ RT - Quickfire Bullet Shield Charge
- LT+ B - Quickfire Snap Flash
I did it in the location after you destroyed your 6th balloon. It is the first spot in the game that has 8 goons in the same location.
(video credit: NewVegasLightning)
Hope this helps you guys!
Any improvements? Please let me know in the comments below!