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As Gilgamesh drop kick the same god into a minion, a god, a wall, and the Winds of Shamash wall in a single match.

Gilgamesh's second ability is Drop Kick. You have a short wind up and then launch a kick in the direction that you are facing. If you hit an enemy god, they will get launched a fair distance in the direction you are facing. They take bonus damage if they are kicked into something, such as another god, wall or minion. For this achievement, you must kick the same god into a minion, a god, a wall and into the inside wall of your ultimate ability, Winds of Shamesh (a large circular sandstorm that you can essentially trap gods inside of), all in a single game.
For this, I'd recommend playing Joust. There are more walls available for you to kick an enemy god into, and fewer gods allowing you to focus your target. I'd also recommend buying items that give you some cooldown reduction, such as Jotunn's, which will allow you to get more uses of Drop Kicks into a match.

This Achievement is for using your drop kick Ability to kick the same God into another god, a minion, a wall, and the wall of you ultimate in a single match. Here is a video for a quick guide to get both Gilgamesh achievements: