Battle.net

Kill 50 supply worth of units within 15 seconds in a Melee game.

Destroy 30 units with Infested Terrans in a single League game.

Attack for 20 seconds with no counterattacks in a League game.

Have 21 Zerg units morphing simultaneously in a League game.

Mutate a Lair during the first 285 seconds of a Melee game.