It didn’t take me more than 10 attempts to get Tugar down, and the worm was down the first time I made it to phase 2. Of course, being ilvl 930+ probably eased the process. The two components that remained challenging were the mobility and the interrupts (Tugar could one shot your pet).
It took us nearly 4 weeks to complete the achievement. We now walk around Azeroth with the most awesome balance artifact appearance.