Proving Yourself: Endless Damage (Wave 30)

I don't know if anybody has mentioned this yet, but DO NOT LEAVE THE SCENARIO via the green eye after completing wave 30. You MUST fail (or yield, didn't test this) at any consecutive wave in order to get the achievement. I've learned this the hard way. Ticket didn't help. GM meant he wasn't able to track my progress, hence no achievement -.-

Summary: Just relax and continue till you fail after wave 30 and you will get your title :)

I thought it important to say that you don't unlock the achievement until the fights end, either with a defeat or by yielding (talking to the panda again).

In Dragonflight, the endless challenge is very easy and I was on level 50 wondering if they took the achievements out or something. Eventually got bored and quit, and that's when it went off.

So no, no need to go past 30 afaik.

MoP Remix is a great time to cheese these achievements. You can queue for it in the Temple of the White Tiger in Kun-Lai Summit. Your tinker and stat gems are disabled but your cloak isn't. I did as a DH with max upgrades (556 upgradable gear) and my cloak had +11k agility. Every fight was super easy and waiting between rounds was the hardest part. I intentionally failed on the 31st round because I just wanted the achievement.