Enchantments

Enchantments are applied to an item using the <enchantment> tag, or nested under a parent <enchantments> tag.

<item amount="1" material="iron pickaxe" slot="0">
  <enchantments>
    <enchantment level="1">dig speed</enchantment> <!-- Efficiency I applied to Iron Pickaxe -->
  </enchantments>
</item>

Atlas allows enchantments to be applied to any item regardless if the enchant was intended for it or not.

Armor Enchantments

ID	Bukkit Name	Minecraft Name	Description
0	PROTECTION_ENVIRONMENTAL	protection	Provides protection against environmental damage.
1	PROTECTION_FIRE	fire_protection	Provides protection against fire damage.
2	PROTECTION_FALL	feather_falling	Provides protection against fall damage.
3	PROTECTION_EXPLOSIONS	blast_protection	Provides protection against explosive damage.
4	PROTECTION_PROJECTILE	projectile_protection	Provides protection against projectile damage.
5	OXYGEN	respiration	Decreases the rate of air loss whilst underwater.
6	WATER_WORKER	aqua_affinity	Increases the speed at which a player may mine underwater.
7	THORNS	thorns	Damages the attacker.
8	DEPTH_STRIDER	depth_strider	Increases the speed at which a player may move underwater.
9	FROST_WALKER	frost_walker	Create frost blocks when walking over water.

Tool Enchantments

ID	Bukkit Name	Minecraft Name	Description
16	DAMAGE_ALL	sharpness	Increases damage against all targets.
17	DAMAGE_UNDEAD	smite	Increases damage against undead targets.
18	DAMAGE_ARTHROPODS	bane_of_arthropods	Increases damage against arthropod targets.
19	KNOCKBACK	knockback	All damage to other targets will knock them back when hit.
20	FIRE_ASPECT	fire_aspect	When attacking a target, has a chance to set them on fire.
21	LOOT_BONUS_MOBS	looting	Provides a chance of gaining extra loot when killing monsters.
32	DIG_SPEED	efficiency	Increases the rate at which you mine/dig.
33	SILK_TOUCH	silk_touch	Allows blocks to drop themselves instead of fragments (e.g., stone instead of cobblestone).
34	DURABILITY	unbreaking	Decreases the rate at which a tool loses durability.
35	LOOT_BONUS_BLOCKS	fortune	Provides a chance of gaining extra loot when destroying blocks.

Bow Enchantments

ID	Bukkit Name	Minecraft Name	Description
48	ARROW_DAMAGE	power	Provides extra damage when shooting arrows from bows.
49	ARROW_KNOCKBACK	punch	Provides a knockback when an entity is hit by an arrow from a bow.
50	ARROW_FIRE	flame	Sets entities on fire when hit by arrows shot from a bow.
51	ARROW_INFINITE	infinity	Provides infinite arrows when shooting a bow.

Fishing Enchantments

ID	Bukkit Name	Minecraft Name	Description
61	LUCK	luck_of_the_sea	Decreases odds of catching worthless junk.
62	LURE	lure	Increases rate of fish biting your hook.

Item Enchantments

ID	Bukkit Name	Minecraft Name	Description
70	MENDING	mending	Repair the item using experience orbs.

Source Credit: Spigot Enchantments