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The Best There Is
Defeat 15 Challenge Card exclusive bosses.
The Best There Is requires you to defeat 15 out of 24 available Challenge Card exclusive bosses in the Brawler's Guild.
Reach Brawler's Guild Rank 8
Progress through the Brawler's Guild to Rank 8 with your faction — Horde at Brawl'gar Arena or Alliance at Bizmo's Brawlpub — before challenge cards become available for purchase.
Purchase Challenge Cards
Buy the darker challenge cards from Card Trader Ami (Horde) or Card Trader Leila (Alliance); these are distinct from rematch cards for your Rank 1–8 fights and include bosses such as A Seagull, Ixx, Millie Watt, Deeken, Akama, Blackmange, Blind Hero, Dark Summoner, Dominika the Illusionist, Fjoll, Fran & Riddoh, and others.
Queue Via Random Brawl
Purchase a 
Bag of Chipped Dice from the Gold Exchange NPC in your arena and present it to an arena bouncer to queue into random brawl mode for 30 minutes, which also grants progress toward this achievement.
Defeat 15 Challenge Bosses
You only need 15 of the 24 available challenge bosses for this achievement, so focus on easier fights first: A Seagull (rotate ~90 degrees for Blinding Peck), Ixx (stay near the centre of the hitbox and run forward on its cast), Millie Watt (stand in pools during Discombobumorphanator casts), Deeken (dodge walls and frontals), and Thog Hammerspace (run away from the boss).
Tips
Party members' kills also count toward your progress, so grouping with others speeds up completion significantly.
Challenge card boss kills obtained through random brawl mode count toward this achievement, letting you combine progress with other Brawler's Guild achievements.