public static void loadAllAchievements() {
		String statement = new String("SELECT * FROM " + DBTable + " WHERE type = ?");
		PreparedStatement stmt;
		try {
			stmt = DBConnection.con.prepareStatement(statement);
			stmt.setInt(1, QUIZ_TAKEN_TYPE);
			ResultSet rs = stmt.executeQuery();
			while (rs.next()) {
				QuizTakenAchievement achievement = new QuizTakenAchievement(rs.getInt("aid"), rs.getString("name"), rs.getString("url"),
						rs.getString("description"), rs.getInt("threshold"));
				allAchievements.add(achievement);
			}
			rs.close();			
		} catch (SQLException e) {
			e.printStackTrace();
		}		
	}