Achievements are here ! We've got a list of all achievements available for all categories, but if you want to go in depths I guess you can always check Wowhead. Note that Feats of Strength aren't real achievements (they won't reward any Achievement point or title / tabard) and are only here to reward your for your past success !
Most of the achievements completed will award Achievement Points, they are only used as ranking purposes and you're probably going to spend a lot of your free time completing all of them just to have more points than your guildmates.
Inscription
A new profession is being introduced to the game, the Inscription. they can of course create the class glyphs used to improve the spells of all classes (see below), but there are also a few more things they can do.
They can create Vellums used by enchanters to store their enchantments for later use. Basically, this is the item used to sell enchantments at the Auction House.
Inscribers can also make Stats enhancement scrolls like the Scroll of Strength IV or any other scroll. They can also create Scroll of Recall but its use will be restricted to other inscribers.
And well, Class Glyphs, obviously.
For more information check the full list of inscription recipes
To create most of their items, Inscribers will need a parchment (bought from NPC vendors) and Inks. The inks are created with pigments obtained by milling herbs gathered by herbalists. (It works the same way as prospecting for jewelcrafters)
Alabaster Pigment - Peacebloom, Silverleaf, Earthroot
Dusky Pigment / Verdant Pigment - Mageroyal, Briarthorn, Swiftthistle, Bruiseweed, Stranglekelp
Golden Pigment / Burnt Pigment - Wild Steelbloom, Grave Moss, Kingsbloom, Liferoot
Emerald Pigment / Indigo Pigment - Fadeleaf, Goldthorn, Khadgar's Wiskher, Wintersbite
Violet Pigment / Ruby Pigment - Firebloom, Purple Lotus, Arthas' Tears, Sungrass, Blindweed, Ghost Mushroom, Gromsbloom
Silvery Pigment / Sapphire Pigment - Golden Sansam, Dreamfoil, Mountain Silversage, Plaguebloom, Icecap
Nether Pigment / Ebon Pigment - Outland herbs
Azure Pigment / Icy Pigment - Northrend herbs
Again, for more information check the full list of inscription recipes. If you're in need of a leveling guide I guess you can always check this one or this one or even this one.