SMITE

As Set, hit three different gods with your clones in a single instance of Skewer

When you summon clones (by either method mentioned in the achievement above), they will stand on the spot they were spawned until you command them otherwise. Using your first ability, Skewer, you'll throw a spear of hatred forward, and your clones will also dash forward to cause damage. The clones will intersect with the skewer targeter depending on where you aim (when you activate the ability in game, you'll see a targeter appear for Skewer, as well as for each clone you currently control).

Clones will pass through enemy gods. This achievement require you to hit three different gods with your clones. This can either be hitting three different gods with a single clone (if they line up) or by hitting three gods with multiple clones. This achievement is probably best attempted in Arena and would do well paired with an ult from Ares, Cerberus or Da Ji.

Another method would be to sneak up to the enemy buffs at the beginning of the game, staying hidden until the buffs spawn, then placing a clone or two behind the enemy gods and throwing Skewer straight away. If you manage to hit three enemy gods, you'll pop the achievement.

Finally, as usual, pairing with a god that has hard CC such as Ares, Da Ji or Cerberus should help get enemy gods into one spot, where you can skewer them all there.