within the onCrafting method within a Crafting handler you can give the player an achievement for crafting somthing:

if (item.itemID == Item.compass.itemID) {
		player.addStat(ExtraAchievments.craftCompass, 1);
	}

I'm wondering how I do this with an item that has metadata/damage values.

I would do something like:

if ( item.itemID == Item.compass.itemID && item.meta == Item.compass.meta && item.getDamage() < item.getMaxDamage() ) {
player.addStat ( ExtraAchievments.craftCompass, 1 );
}

I would do something like:

if ( item.itemID == Item.compass.itemID && item.meta == Item.compass.meta && item.getDamage() < item.getMaxDamage() ) {
player.addStat ( ExtraAchievments.craftCompass, 1 );
}

Thanks, but how would i do a specific damage value?

like in "new ItemStack(Item.compass, 1, 3)" the item has a damage value of 3.

how would i do something like that?

also, "meta cannot be resolved or is not a field"