Kandarin Diary. The main reward is Kandarin Headgear 4 - Although it is the same type of item the same as Mithril Med Helm, it also offers a range of RuneScape gold bonuses that are similar to the other Elite Diary rewards. Those bonuses include:
33% more efficient spinning on Seers Village Spinning Wheel, that could prove beneficial to those who are looking to make more gold coins. 15 percentage more grace marks from Seers' Village Agility Course that could be used to make the process of farming for Graceful Outfit slightly less painful. It is possible to move Camelot by teleporting from the castle directly to the bank's entrance. 10 percent more rewards for Barbarian Assault, as well as other advantages.
When they complete every Achievement for each of the challenges in the Achievement Diary players gain access to unique Achievement Diary Cape, which they can purchase from Twiggy O'Korn in Draynor Village for 99,000 Coins. Also, they'll also be rewarded with a unique hood to match the cape.
As completing the challenge requires more than 99 levels across a variety of techniques, it's one of the most difficult items to get in OSRS. The cape provides a +9 bonus for cheap OSRS GP each combat skill and 10 teleport points (rechargeable each day) for each Achievement Diary master. Owners can also activate an emote in celebration of their hard work.