Win a round by picking up the bomb from a fallen comrade and successfully planting it

Kill an enemy while you are blinded from a flashbang

Win an Arms Race match without dying

Kill an enemy with the first bullet after your respawn protection ends in Arms Race mode

Kill an enemy whom you are already dominating

Be the first player to get a kill in an Arms Race or Demolition match

Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing)

Obtained all iPod® tracks (excluding tracks obtained via password).

Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)

Kill an enemy who is leading the hostages without injuring the hostages

Kill an enemy while they are reloading

Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)