Guild Wars 2

As of 12/03 i’m unable to do it, even though i ought to be able to.

1. I close in on Scarlet avoiding the bombs with swiftness and stability (war balanced stance);
2. after the 3 bomb spreads she starts channeling the aoe and I wait for her taser (which – i’m assuming – you can’t avoid since in every video i’ve watched the person dodgerolls right after the stun fades) to come out;
3. spam my dodge key (to the side and not into her), but it doesn’t let me dodge (as in i’m stunned for longer than i should) and i’m knocked back by her AoE;
4. run back in (as you noticed without EVER trying to finish her, or even touching her for that matters) and wait for her AoE and taser again;
5. dodge roll correctly right after the stun ends, avoiding the second knockback;
6. use quickness (war frenzy) immediately after coming out of dodge and spam my finisher key;
7. finisher animation doesn’t even start because the female dog activates her shield (wihout me EVER damaging her or channeling my finisher move).

I’ve only been trying this on my charr warrior (had a few bad runs before understanding the mechanics of the encounter) for she’s the one with the back item, and the last 3 runs have gone exactly like i described.

If I’m missing anything (or you know tricks that still work for warrior) pls let me know, it would bother me to have to give up on the achievement since i never missed any from the living story and i’m kinda OCD about this :P

EDIT: Sorry for text wall and useless post. I just got it.
Unless you have stealth (thief/ranger) or can become invulnerable while stomping (ele/guard?/engi) you have to:
1. get to Scarlet without using your dodge roll;
2. start channeling stomp, then dodge out of it right BEFORE she hits you with taser, because first stun lasts longer than subsequent ones, but dodging stun AND AoE knockback at the same time (double roll if you are unsure whether you made it);
3. cast QUICKNESS and start real stomp, because if you stomp without it she WILL have another taser stun ready BEFORE you finish her. Don’t know if it’s intended or not, still annoying as kitten.

Hope that helped.