Complete the [70 Daily] Bomb Them Again! quest in under 2 minutes 15 seconds while not in a group.
Blade's Edge Bomberman is an achievement for completing a very skilled run of the daily quest [70 Daily] Bomb Them Again!, a Sha'tari Skyguard reputation quest. The timer starts when the quest is picked up, and ends when it is turned in. If you track the achievement, you can see how much time you have remaining.