Achievement Diaries are structured challenges tied to different areas of Gielinor. Each region offers four tiers of tasks: Easy,Medium,Hard,and Elite. These tasks range from simple skill actions to high-level bossing and quest completion.

Upon finishing a tier,you can speak to the corresponding NPC in that region to claim:

An XP lamp (scaling with difficulty)

A region-specific reward item (like the Falador Shield or Wilderness Sword)

Several gameplay unlocks,such as free teleports,reduced resource consumption,or passive XP features

Though these diaries may not directly grant large amounts of OSRS gold,they significantly enhance your gold-earning potential and overall efficiency. Some unlocks are so impactful that they can make or break your long-term success in OSRS,particularly for accounts focused on bossing,clue scrolls,or high-level Slayer.
Desert Diary: Quick Access and Free Healing

The Elite Desert Diary is one of the more accessible high-level diaries,especially for non-Ironman players.
Key Rewards:

Kalphite Queen Shortcut: Shortens the bank-to-boss time dramatically,making Kalphite Queen much more manageable.

Every player needs a lot of RuneScape gold, I suggest you go to a third-party website like RSorder.com to buy, safe and comfortable transactions, and years of experience to ensure the security of your account.