Here's my implementation of `Q.allSettled` for AngularJS, which I've named `allComplete`. Due to a bug in this Gist editor, I had to give this gist a .js extension file name, but this would typically go within your services.js file (depending on your project structure).

$q.allComplete.js

angular.module('App.services', ['ngResource'])
  .config( function($provide) {
    $provide.decorator("$q", ["$delegate", function($delegate) {
      var $q = $delegate;

      $q.allComplete = function(promises) {

        if(!angular.isArray(promises)) {
          throw Error("$q.allComplete only accepts an array.");
        }

        var deferred = $q.defer();
        var passed = 0;
        var failed = 0;
        var responses = [];

        angular.forEach(promises, function (promise, index) {
          promise
            .then( function(result) {
              console.info('done', result);
              passed++;
              responses.push(result);
            })
            .catch( function(result) {
              console.error('err', result);
              failed++;
              responses.push(result);
            })
            .finally( function() {
              if((passed + failed) == promises.length) {
                console.log("COMPLETE: " + "passed = " + passed + ", failed = " + failed);

                if(failed > 0) {
                  deferred.reject(responses);
                } else {
                  deferred.resolve(responses);
                }
              }
            })
          ;
        });

        return deferred.promise;

      };

      return $q;
    }]);
  })
;

This implementation here is wrong - the order of the responses is incorrect.

A much more elegant implementation (minus the decorator) would be something like Q itself does, something like:

$q.allSettled = function (promises) {
    return Q.all(promises.map(function (promise) {
            return Q(promise).then(function(val){ 
                return {state: "fulfilled", value: val };     
            }, function(err){
                return {state: "rejected", reason: err };
            });
        }));
    });
};