Stall the game. Get your Order of the Spire to 999 health. Play Healer's Cloak on it. You now have the Healthy achievement.
Attack with all your units. Remember, you need the opponent to -999 health. So keep his board clear throughout the game. And make sure to perform your final attack with all your units. Once you've done this, you now have the So Satisfying achievement.
Protect your Order of the Spire throughout the game with Protect.