Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Kill 3 enemies with a single round.

Reimprison Ahriman.

Final Healing.

Kill the Hunter in his Lair.

Kill the Alchemist in his Observatory.

Collect 500 Light Seeds.

Use the environment against an enemy.

Collect 400 Light Seeds.

Collect 300 Light Seeds.

Collect 200 Light Seeds.

Defeat the Alchemist without using the acrobatic attack.