Knight Defense HD [iPhone]

Game Center achievements
Complete the following tasks to unlock Apple Game Center achievements.
A+ Student: Complete the tutorial.
All Too Easy: Complete 5 easy levels.
Archibishop: Upgraded a Bishopto Rank MAX.
Emperor: Upgraded a King to Rank MAX.
Empress: Upgraded a Queen to Rank MAX.
Flawless: Win without any enemies exploding into your pieces.
Fortress: Upgraded a Rook to Rank MAX.
Grapeshot: Scored a 10-hit combo.
I Punched Evil in the...: Complete the "Big Badda Boom" level.
I'm Hardcore: Complete 5 hard levels.
Just Right: Complete 5 medium levels.
Line 'em up: Scored a 5-hit combo.
Power Overwhelming: Scored a 20-hit combo.
Run Around: Win without upgrading any pieces.
Tank: Have a piece at a defense level of 7 or higher.
Templar: Upgraded a Knight to Rank MAX.
Thick Skull: Win by having all enemies explode into your pieces.
Trooper: Upgraded a Pawn to Rank MAX.