ADD:: class of achievements list

src/Server/src/main/java/greenify/server/AllAchievements.java

@@ -0,0 +1,23 @@
+package greenify.server;
+
+import greenify.server.data.model.Achievement;
+
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.List;
+
+public class AllAchievements {
+    private static final List<Achievement> allAchievements = Arrays.asList(
+            new Achievement("Starting off", "You did your first green activity", false),
+            new Achievement("Social butterfly", "You added three friends", false)
+    );
+
+    /**
+     * This method gets default achievements.
+     * @return the list of default achievements
+     */
+    public static List<Achievement> getDefaults() {
+        return new ArrayList<>(allAchievements);
+    }
+
+}

src/Server/src/test/java/greenify/server/AllAchievementsTest.java

@@ -0,0 +1,21 @@
+package greenify.server;
+
+import greenify.server.data.model.Achievement;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class AllAchievementsTest {
+
+    @Test
+    void getDefaultsTest() {
+        List<Achievement> all = new ArrayList<Achievement>() {{
+            add(new Achievement("Starting off", "You did your first green activity", false));
+            add(new Achievement("Social butterfly", "You added three friends", false));
+        }};
+        assertEquals(all.size(), AllAchievements.getDefaults().size());
+    }
+}