This was the deck I used to get the No Pathetic Cards achievement.

Core of this deck is the Dragon Priest package with the following cards having a special purpose:

• Cleric of Scales » Fetch 1 of the 4 C'Thun pieces
• Raise Dead » Hope to get Cleric of Scales back and repeat the previous
• Jepetto Joybuzz » When all 4 C'Thun pieces have been played, fetch C'Thun, the Shattered from your deck for 1 single mana
• Plague of Death » Hold until you have C'Thun, the Shattered for 1 single mana

Extra requirements:

• Control the board until you have 10 mana and the combo pieces
• Keep the opponent at full health as long as possible (especially at the combo turn)
• Hope you do not draw C'Thun, the Shattered for full 10 mana cost
• Pray for an opponent that does not rage quit (concede) and let you finish getting the achievement

Enjoy & Good luck! 😊

PS.: When your opponent is a Warlock or Warrior either concede or do not expect too much, since their health/armor total during the whole game will be mostly out of your control anyways.