Battle.net

Kill 15 enemy units with a single Nuke in an Unranked or Ranked game.

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

Attack for 20 seconds with no counterattacks in an Unranked or Ranked game.

Destroy 4 Command Centers, Hatcheries, or Nexuses in an Unranked or Ranked game.

Complete all the Guide Three achievements.