fix(game): remediate server error from 'Updated' field

[wescopeland]

Resolves Undefined array key "Updated".

Root Cause

$achievement = Achievement::where('GameID', $achievementSetClaim->game->id)
    ->where('user_id', $achievementSetClaim->user->id)
    ->orderByDesc('Updated')
    ->first(['Updated as updated_at']); // <------------

The Achievement model accessor is looking for Updated, not updated_at, so this is causing the model to throw an error.