Here is the full list of all 15 Didgery achievements.
Destroy an entire column of cards
Perform your first Holy Explosion
Create 5000 chains
Unlock Nightmare Mode
Keep the Earth from descending into Hell for at least 50 mins
Create a chain that includes more than eight cards
Summon Didgery five times
Unlock an Artifact using a Didgery Summon
Unlock all Forbidden Parchments
Unlock your first Forbidden Parchment
Destroy an entire row of cards
Create a chain consisting of four sevens
Unlock all Special Cards
Create a chain that includes three special cards
Include all four Kings and all four Queens in a single chain