diff --git a/website/public/js/controllers/partyCtrl.js b/website/public/js/controllers/partyCtrl.js
index ea0f3fa8bd..61b3cb0ac6 100644
--- a/website/public/js/controllers/partyCtrl.js
+++ b/website/public/js/controllers/partyCtrl.js
@@ -2,6 +2,9 @@
 
 habitrpg.controller("PartyCtrl", ['$rootScope','$scope','Groups','Chat','User','Challenges','$state','$compile','Analytics','Quests','Social',
     function($rootScope,$scope,Groups,Chat,User,Challenges,$state,$compile,Analytics,Quests,Social) {
+
+      var user = User.user;
+
       $scope.type = 'party';
       $scope.text = window.env.t('party');
       $scope.group = $rootScope.party = Groups.party();
@@ -11,6 +14,20 @@ habitrpg.controller("PartyCtrl", ['$rootScope','$scope','Groups','Chat','User','
 
       if ($state.is('options.social.party')) {
         $scope.group.$syncParty(); // Sync party automatically when navigating to party page
+
+        // Checks if user's party has reached 2 players for the first time.
+        if(!user.achievements.partyUp
+            && $scope.group.memberCount >= 2) {
+          user.achievements.partyUp = true;
+          $rootScope.openModal('achievements/partyUp', {controller:'UserCtrl', size:'sm'});
+        }
+
+        // Checks if user's party has reached 4 players for the first time.
+        if(!user.achievements.partyOn
+            && $scope.group.memberCount >= 4) {
+          user.achievements.partyOn = true;
+          $rootScope.openModal('achievements/partyOn', {controller:'UserCtrl', size:'sm'});
+        }
       }
 
       Chat.seenMessage($scope.group._id);
diff --git a/website/src/models/user.js b/website/src/models/user.js
index f9ac573179..74068b3ed1 100644
--- a/website/src/models/user.js
+++ b/website/src/models/user.js
@@ -59,7 +59,9 @@ var UserSchema = new Schema({
     greeting: Number,
     thankyou: Number,
     costumeContests: Number,
-    birthday: Number
+    birthday: Number,
+    partyUp: Boolean,
+    partyOn: Boolean
   },
   auth: {
     blocked: Boolean,
@@ -519,7 +521,7 @@ UserSchema.pre('save', function(next) {
   var mountMasterProgress = shared.count.mountMasterProgress(this.items.mounts);
 
   if (mountMasterProgress >= 90 || this.achievements.mountMasterCount > 0) {
-    this.achievements.mountMaster = true
+    this.achievements.mountMaster = true;
   }
 
   // Determines if Triad Bingo should be awarded
@@ -531,6 +533,18 @@ UserSchema.pre('save', function(next) {
     this.achievements.triadBingo = true;
   }
 
+  // Determines if Party Up should be awarded
+
+  if (this.party.memberCount >= 2) {
+    this.achievements.partyUp = true;
+  }
+
+  // Determines if Party On should be awarded
+
+  if (this.party.memberCount >= 4) {
+    this.achievements.partyOn = true;
+  }
+
   // Enable weekly recap emails for old users who sign in
   if(this.flags.lastWeeklyRecapDiscriminator){
     // Enable weekly recap emails in 24 hours
diff --git a/website/views/shared/modals/achievements.jade b/website/views/shared/modals/achievements.jade
index fdb7c02e1a..6f03746a07 100644
--- a/website/views/shared/modals/achievements.jade
+++ b/website/views/shared/modals/achievements.jade
@@ -83,7 +83,6 @@ script(id='modals/achievements/beastMaster.html', type='text/ng-template')
       button.btn.btn-primary(ng-click='$close()')=env.t('huzzah')
     +achievementFooter
 
-
 // Mount Master
 script(id='modals/achievements/mountMaster.html', type='text/ng-template')
   .modal-content(style='min-width:28em')
@@ -132,3 +131,25 @@ script(id='modals/achievements/rebirth.html', type='text/ng-template')
       br
       button.btn.btn-primary(ng-click='$close()')=env.t('huzzah')
     +achievementFooter
+
+// Party Up
+script(id='modals/achievements/partyUp.html', type='text/ng-template')
+  .modal-content(style='min-width:28em')
+    .modal-body.text-center
+      h3(style='margin-bottom:0')=env.t('modalAchievement')
+      +achievementAvatar('partyUp',0)
+      p=env.t('partyUpAchievement')
+      br
+      button.btn.btn-primary(ng-click='$close()')=env.t('huzzah')
+    +achievementFooter
+
+// Party On
+script(id='modals/achievements/partyOn.html', type='text/ng-template')
+  .modal-content(style='min-width:28em')
+    .modal-body.text-center
+      h3(style='margin-bottom:0')=env.t('modalAchievement')
+      +achievementAvatar('partyOn',0)
+      p=env.t('partyOnAchievement')
+      br
+      button.btn.btn-primary(ng-click='$close()')=env.t('huzzah')
+    +achievementFooter