Immortals Fenyx Rising

This is tied to the new Heroic Gifts ability system. It's a little overwhelming at first so I'll try to explain as simply as possible. When you are able to gain offensive nodes in abilities like Swordswoman, Axebearer, and Archer, you want to first unlock the Boreas's Devastation node (leftmost one, it has a fist). You then want to apply an Essence of Chaos (purple tile). These allow your weapons to gain a chance (this varies on what weapon you use it on) to gain half a health chunk back when attacking an enemy.

Note that you will get all of these gems and upgrade materials just playing normally.

The easiest way to go for this achievement is to upgrade your bow with this leeching ability. It's weak and fires fast and with an 8% chance, this let's you have one of the higher chances to gain health back. You also stay away from health orbs, which make going for this achievement rather annoying when they just heal you to almost full. You then want to find a large group of enemies (shouldn't be hard in this DLC) and let them beat the crap out of you. After you gained at least half a health chunk of damage, just kite around the enemies and shoot them with your bow.

The achievement is cumulative and also tracks, so once you gain a total of 10 health chunks back, the achievement will unlock.

The easiest way to earn this is to unlock the Borea's Devastation on a weapon, preferably your crossbow, and equip a purple essence of chaos to it. This can all be done at an altar. Doing this, will give you an 8% chance to gain half a health chunk from hitting an enemy with an arrow. In order to gain health, you need to have lost some health. So let some enemies damage you and then attack them from range with your bow until you regain health. Rinse and repeat.