SMITE

As Tiamat, have each of your creatures assist your player kills in a single match.

Tiamat has two main ultimate abilities, one in each stance. In her flying stance, her ultimate ability is called Children of Creation. When activated, it allows you to summon some of Tiamat's minions. This is kind of like Merlin's ultimate where you can activate it then quickly choose another your chosen ability. If you activate your ultimate, you'll get three option. If you hit your 1, you'll spawn a pit that summons two serpents that spawn every 10s and the deployable creates 3 waves before disappearing. These will attack anything in their path and will home in on enemies of all types.

Your two will summon a minion called Kusarikku, that will stand in the place it is summoned and damage any enemy that comes into range. Your third ability will summon a storm that will knock up and damage enemies.

For this achievement, use each summonsed monster to deal damage to an enemy god before you get the kill on them, all in a single match. It has been reported that the minion must still be alive when you get the kill.
The best mode for this would also be Arena.