Our past tier progression

[Mari]

Cataclysm

Instance	Normal	Heroic
Blackwing Descent	Clear
Throne of the Four Winds	Clear
The Bastion of Twilight	Clear
Firelands	Clear	1/7
Dragon Soul	Clear	1/8

Pandaria

Instance	Normal	Heroic
Mogu'shan Vaults	Clear
Heart of Fear	Clear
Terrace of the Endless Spring	Clear
Throne of Thunder	Clear	6/13
Siege of Orgrimmar	Clear	7/14

Dreanor

Instance	Normal	Heroic	Mythic
Highmaul	Clear	Clear
Blackrock Foundry	Clear	8/10
Hellfire Citadel	Clear	Clear	4/13