diff --git a/migrations/archive/2023/20231017_pet_group_achievements.js b/migrations/archive/2023/20231017_pet_group_achievements.js
new file mode 100644
index 0000000000..25c46f2c16
--- /dev/null
+++ b/migrations/archive/2023/20231017_pet_group_achievements.js
@@ -0,0 +1,118 @@
+/* eslint-disable no-console */
+const MIGRATION_NAME = '20231017_pet_group_achievements';
+import { model as User } from '../../../website/server/models/user';
+
+const progressCount = 1000;
+let count = 0;
+
+async function updateUser (user) {
+  count++;
+
+  const set = {
+    migration: MIGRATION_NAME,
+  };
+
+  if (user && user.items && user.items.pets) {
+    const pets = user.items.pets;
+    if (pets['Armadillo-Base']
+      && pets['Armadillo-CottonCandyBlue']
+      && pets['Armadillo-CottonCandyPink']
+      && pets['Armadillo-Desert']
+      && pets['Armadillo-Golden']
+      && pets['Armadillo-Red']
+      && pets['Armadillo-Shade']
+      && pets['Armadillo-Skeleton']
+      && pets['Armadillo-White']
+      && pets['Armadillo-Zombie']
+      && pets['Cactus-Base']
+      && pets['Cactus-CottonCandyBlue']
+      && pets['Cactus-CottonCandyPink']
+      && pets['Cactus-Desert']
+      && pets['Cactus-Golden']
+      && pets['Cactus-Red']
+      && pets['Cactus-Shade']
+      && pets['Cactus-Skeleton']
+      && pets['Cactus-White']
+      && pets['Cactus-Zombie']
+      && pets['Fox-Base']
+      && pets['Fox-CottonCandyBlue']
+      && pets['Fox-CottonCandyPink']
+      && pets['Fox-Desert']
+      && pets['Fox-Golden']
+      && pets['Fox-Red']
+      && pets['Fox-Shade']
+      && pets['Fox-Skeleton']
+      && pets['Fox-White']
+      && pets['Fox-Zombie']
+      && pets['Frog-Base']
+      && pets['Frog-CottonCandyBlue']
+      && pets['Frog-CottonCandyPink']
+      && pets['Frog-Desert']
+      && pets['Frog-Golden']
+      && pets['Frog-Red']
+      && pets['Frog-Shade']
+      && pets['Frog-Skeleton']
+      && pets['Frog-White']
+      && pets['Frog-Zombie']
+      && pets['Snake-Base']
+      && pets['Snake-CottonCandyBlue']
+      && pets['Snake-CottonCandyPink']
+      && pets['Snake-Desert']
+      && pets['Snake-Golden']
+      && pets['Snake-Red']
+      && pets['Snake-Shade']
+      && pets['Snake-Skeleton']
+      && pets['Snake-White']
+      && pets['Snake-Zombie']
+      && pets['Spider-Base']
+      && pets['Spider-CottonCandyBlue']
+      && pets['Spider-CottonCandyPink']
+      && pets['Spider-Desert']
+      && pets['Spider-Golden']
+      && pets['Spider-Red']
+      && pets['Spider-Shade']
+      && pets['Spider-Skeleton']
+      && pets['Spider-White']
+      && pets['Spider-Zombie']) {
+        set['achievements.duneBuddy'] = true;
+      }
+  }
+
+  if (count % progressCount === 0) console.warn(`${count} ${user._id}`);
+
+  return await User.updateOne({ _id: user._id }, { $set: set }).exec();
+}
+
+export default async function processUsers () {
+  let query = {
+    migration: { $ne: MIGRATION_NAME },
+    'auth.timestamps.loggedin': { $gt: new Date('2023-09-16') },
+  };
+
+  const fields = {
+    _id: 1,
+    items: 1,
+  };
+
+  while (true) { // eslint-disable-line no-constant-condition
+    const users = await User // eslint-disable-line no-await-in-loop
+      .find(query)
+      .limit(250)
+      .sort({_id: 1})
+      .select(fields)
+      .lean()
+      .exec();
+
+    if (users.length === 0) {
+      console.warn('All appropriate users found and modified.');
+      console.warn(`\n${count} users processed\n`);
+      break;
+    } else {
+      query._id = {
+        $gt: users[users.length - 1]._id,
+      };
+    }
+
+    await Promise.all(users.map(updateUser)); // eslint-disable-line no-await-in-loop
+  }
+};