Didn't necessarily look like Achilles to me. Looked like a calf or hammy thing to me. Hopefully just a cramp, as that's how you react when you have a cramp like that. I remember both of my calfs simultaneously cramping up on me in a summer basketball game once, and I fell down like I got shot from it. Worst pain I can remember playing ball.
For God's sake, though, hopefully it's not the Achilles or a major strain.
I've asked this here and looked around online about KP being questionable today, but I couldn't find anything supporting that. But there's going to be some major questions if he was questionable and ended up playing and got injured.