It is in OldSchool RuneScape, just like in other MMO titles, players can find accomplishments. They provide trophies that come in a variety of RuneScape gold forms, such as an item, a title, or a notice that you can get by doing various tasks that are notable. For instance, if you beat the boss, who was defeated only by a small number of players, you might receive a trophy.
In addition to that, in OSRS there is also an individual Achievement Diary, which is the book that gathers all your notable achievements together in one place. Furthermore, they are also separated into specific areas that you can obtain them. For instance, finishing challenges around Varrock will result in filling Varrock Diary.
When they finish their Diaries the players are rewarded with exclusive sets and other items only available from those activities. There are currently twelve diaries available for OSRS players, which are Ardougne, Desert, Falador, Fremennik, Kandarian, Karamja, Kourend & Kebos, Lumbridge & Draynor, Morytania, Varrock, Western Provinces, along with The Wilderness Diary.
Achievement diaries are split in four categories depending on the difficulty level - easy medium, difficult, elite. The initial ones are usually simple and usually don't require a lot of time or effort. They don't need skills above level 40. Medium-level tasks are most of buy runescape 3 gold the time similarly simple although they might require some skills to be at level 65. Hard ones, as the title implies, are more demanding and require specific abilities to reach a level around 75.