What the achievement asks
Complete the Pride of Kul Tiras storyline. Ten points, account-wide, Alliance only. It also gives the Proudmoore Green Drape, a decoration.
Where it comes in
This is the chapter where Kul Tiras finally commits to the Alliance, and it sits after the three zone stories rather than inside any of them.
That ordering is the only thing to plan around: the storyline does not appear until Tiragarde Sound, Stormsong Valley and Drustvar have each been finished, because the whole point of it is the three houses agreeing at last.
What has to be done first
- Come Sail Away, the introduction to Kul Tiras
- A Sound Plan, the Tiragarde Sound story
- Stormsong and Dance, the Stormsong Valley story
- Drust Do It., the Drustvar story
Those four in that order, and this one follows. If it is not showing up, one of the three zones is not actually finished, which is worth checking against the achievement list rather than memory: the zone stories all have optional side chains that are easy to leave undone.