Taskmaster is an emote awarded after completing all 573 tasks. It is the third emote to utilise Z-buffering (the first being Faint, the second being Puppetmaster), taking the player out of the "grid" to which it was restricted in past animations. It requires a clear 3×3 area to be performed.
The current XP required to complete all of the Tasks is 90,921,673, excluding skill requirements of quests required for some Tasks and assuming no skill boosts are used. This is roughly 4.5 times the amount of experience required to complete all current quests and earn the Quest point cape.
Upon the release of the Burthorpe/Taverley tasks (31st January 2012), the tasks system still said you needed 426 tasks completed. If a player completed enough tasks, and reached the 426 milestone, they were informed that they could do the task master emote, and the icon would light up in the emote tab. However, attempting to do the emote resulted in being told you needed to complete all tasks. If a player went past the 426 total, the emote icon would become dulled out again.