SMITE

As Surtr, empower Flames of Muspell with bonus damage stacks at least 30 times in a single match.

Flames of Muspell is Surtr’s first ability. When you use it, your next successful basic attack will do bonus damage to an enemy as well as igniting them causing damage over time, and spawning a fiery imp.

If an enemy dies while the burning effect is active, you gain a stack on this ability, and the bonus damage the attack does will increase.

For this achievement, you need to get 30 stacks, so have 30 enemies die while affected by burn damage from your 1.

This work for all enemies; minions, enemy gods and jungle camps.

This is best attempted in Arena, due to how closely enemies bunch up and how more likely you are to get assists on gods that you may have ignited. Focus on igniting the jungle camps at the start and as many minions as you can as they’ll die easy.

You can buy some items that reduce cool-down so you can use your 1 as often as you can.