Battle.net

Create 100 Larvae with Queens in a single League game.

Have 21 Zerg units morphing simultaneously in a League game.

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

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

Destroy an enemy Command Center, Hatchery, or Nexus while it is under construction in a League game.