Flintlock: The Siege of Dawn

An unmissable achievement that requires you to beat the final boss. My best advice is to equip two armor pieces from the Sapper set for the powder-restoring bonuses, and spam the hell out of the flintlock. You can't riposte Uru, so don't even bother learning his attack patterns or parry timings. Just shoot him whenever he goes to attack, and make sure to curse and attack him in-between. When he flies into the air, run away as fast as possible, and watch for when he dives at you in order to dodge.

Second phase is more or less the same, except you can't use magic attacks. You have to watch out though, because he can mixup his usual attacks with a quick teleport and screw you over. Just be a little more patient with your shots and you'll be fine. One last thing to watch out for is that when his health is at 0 and he's open to finish off, he recovers really quickly if you wait too long. Just finish him with a final shot ASAP to avoid the trouble of him regaining 1/4 of his health.

Really glitchy and poorly designed boss, but not that difficult.