Here is the full list of all 18 Floppy Knights achievements.
Complete all Objectives in Episode 7
Unlock another new deck
Complete a level with a deck of 30 cards
Unlock a new deck
Complete all Objectives in Episode 1
Complete a level with just a Commander
Complete all Objectives in Episode 2
Complete all Objectives in Episode 3
Complete all Objectives in Episode 4
Complete all Objectives in Episode 5
Complete all Objectives in Episode 6
Spend 1000 BigCoin in the Workshop
Acquire every card
Complete Molten Mania with Bernard at full HP
Complete Old Friends with Bernard at full HP
Complete Finals in Science Fair with a deck of 12 cards
Complete Squad Attack in a single turn
Conquer all Challenge Levels