Hey Folks, NOTE: My achievement popped when I completed Azrael's Atonement, which would have been 25-stars for me. Since the same thing happened to my Catwoman achievement, I am going to assume that one (or more) of the previous challenges did not count for Nightwing, as I went straight down the combat challenge list.... Please comment if you have the same issues.
For this Achievement, you need to earn 21 stars as Nightwing, which is actually quite simple with all the AR challenges that Arkham Knight has to offer. You should be able to unlock this by doing the Combat or Predator Challenges. You do not need to 3-star the challenges, just accumulate 21 total stars. The challenges that have Batman and Nightwing teaming up DO NOT count for this achievement.
Combat Reminder/Hint: Environmental Takedowns are a x100 multiplier, so use them if available on a high combo. Also, for getting a freeflow perfection(never breaking your combo) you will score your strike counter multiplied by 100 at the end of the round. (22 combo x 100 = 2200 bonus)
A Hint as Nightwing:
-Nightwing does not have the destroy weapon ability like Batman does. However, picking up a baseball bat of the ground (
) will allow you to wail on as many thugs as possible which I found very useful in the combat challenges. You can also use Nightwings escrima stick ricochet (
) to disarm all nearby enemies.
You can play the following challenges to get 21 stars(my stars are in parentheses):
-Shark Bait (3 stars)
-Precinct (3 stars)
-High Interest (3 stars)
-Flying Grayson (make sure to use environmental takedowns) (3 stars)
-Feline Frenzy (The baseball bat is very helpful here) (3 Stars)
-Newton's Cradle (3 Stars)
-Teen Titan (2 Stars)
-Combo Master (3 Stars)
-Azrael's Atonement (2 Stars)
-Smash and Grab
-Revive and Shine
-Under the Pale Moonlight
That's a total of 60 Stars, so play at your strengths, and don't stress out too much.