I'm prepping for a completely different type of surgery, but I may be able to offer a little more advice :)  Netflix is a lifesaver - you can get it for the free trial period, and have all of the movies you want!  It's also a good time to catch up on full seasons of shows that you always meant to watch but didn't.

If you have any pets, you should make sure that someone else is available to care for them.  You certainly won't feel like long potty walks with the pooch! ;)

If you'll have to sleep on your back for a long time (I'm not sure what the protocol is for an achilles tendon), look into a "husband" or "dorm" style pillow - one of the ones that looks like a chopped-off back of a recliner.  They give you an opportunity to sit up comfortably, and take some pressure off of your rump and back - all without having to move very far! :)

I hope you have a speedy recovery, and I hope I was able to be of some help.