diff --git a/script.js b/script.js
index fc0fd13..68cdb1e 100644
--- a/script.js
+++ b/script.js
@@ -1,26 +1,57 @@
 let mass = 0;
-let planets = 0;
+let planetCount = 0;
 let planetCost = 10;
-
-function updateDisplay() {
-    document.getElementById('mass').innerText = mass;
-    document.getElementById('planets').innerText = planets;
-    document.getElementById('planetCost').innerText = planetCost;
-    document.querySelector('button[onclick="buyPlanet()"]').disabled = mass < planetCost;
-}
+let massPerClick = 1;
+let achievements = [];
 
 function generateMass() {
-    mass += 1;
-    updateDisplay();
+    mass += massPerClick;
+    document.getElementById('mass').textContent = mass;
+    checkAchievements();
 }
 
 function buyPlanet() {
     if (mass >= planetCost) {
         mass -= planetCost;
-        planets += 1;
+        planetCount++;
         planetCost = Math.floor(planetCost * 1.5);
-        updateDisplay();
+        document.getElementById('mass').textContent = mass;
+        document.getElementById('planetCount').textContent = planetCount;
+        document.getElementById('planetCost').textContent = planetCost;
+        checkAchievements();
+    }
+}
+
+function buyUpgrade() {
+    const upgradeCost = 50;
+    if (mass >= upgradeCost) {
+        mass -= upgradeCost;
+        massPerClick *= 2;
+        document.getElementById('mass').textContent = mass;
+        document.getElementById('upgradeBtn').style.display = 'none';
+        checkAchievements();
     }
 }
 
-updateDisplay();
\ No newline at end of file
+function checkAchievements() {
+    if (mass >= 100 && !achievements.includes('Mass Master')) {
+        achievements.push('Mass Master');
+        addAchievement('Mass Master');
+    }
+    if (planetCount >= 5 && !achievements.includes('Planet Pioneer')) {
+        achievements.push('Planet Pioneer');
+        addAchievement('Planet Pioneer');
+    }
+}
+
+function addAchievement(name) {
+    const achievementList = document.getElementById('achievementList');
+    const listItem = document.createElement('li');
+    listItem.textContent = name;
+    achievementList.appendChild(listItem);
+}
+
+// Initial UI update
+document.getElementById('mass').textContent = mass;
+document.getElementById('planetCount').textContent = planetCount;
+document.getElementById('planetCost').textContent = planetCost;
\ No newline at end of file