Searching the massive achievments array

I was hoping someone might be so kind as to point me in the right direction, or share with me their solution to searching the massive array we get from here: http://us.battle.net/api/wow/data/character/achievements for a given achievement ID.

Other threads on this:
http://stackoverflow.com/questions/16783278/php-search-massive-array-for-value-return-parent-key

Sofar ive started breaking down the original array into its 10 categories and I was then going to search each one of those arrays until I found the ID i was looking for, but i feel as if there must be an easier way.

ex of what I have sofar:

$allAchieves = file_get_contents('http://us.battle.net/api/wow/data/character/achievements');
$allAchieves = json_decode($allAchieves, true);

$generalAchieves = $allAchieves[achievements][0][achievements];
$quests = $allAchieves[achievements][1][categories];
$explorationAchieves = $allAchieves[achievements][2][categories];
$pvp = $allAchieves[achievements][3][categories];
$dungeonAndRaids = $allAchieves[achievements][4][categories];
$professions = $allAchieves[achievements][5][categories];
$reputation = $allAchieves[achievements][6][categories];
$scenarios = $allAchieves[achievements][7][categories];
$worldEvents = $allAchieves[achievements][8][categories];
$petbattle = $allAchieves[achievements][9][categories];
$featsOfStrength = $allAchieves[achievements][10][categories];

As always, thanks for any help / guidance / or input!