Having no experience yet on the camino I can give you some insight on hiking/trekking in general: it really all comes down to the type of terrain and weather you're going to be walking in, the difference on the Camino is that most people are walking 30 + days straight which is unusual for most trekkers.
First off, there are people who will do fine with running sneakers but I do not think it's approppriate nor safe for off road hiking specially with up/down hills so I will not include them here. Now, since the weather and terrain can vary immensly you have to be ready for all. With the expeption of a few $600+ Alpine boots, no hiking footwear is really waterproof, most are barely water repellent so since is very likely it will rain during your camino (some times more than others) "waterproof" shoes are essential. Full leather are the best but not suited to the long, extended and warm walk which is what most people do. So then you should look into "breathable" waterproof shoes (the ones with mesh patches) which will provided enough air to cool your feet, some protection during the more or less occasional rain and quick drying when wet.
For long distance walking lighter is a rule of thumb so eventhough a pair of light mid cut boots still weight around 2lbs (sz.10.5US) they still my footwear of choice. Most of the reputable brands will also make a low cut version which would be my next choice but for my first trip (Oct/Nov) I would feel better taking the mid cut ones for ankle support specially if you're not used to walking on uneven terrain. Vibram makes one of the lightest, softer (not as durable), grippiest soles on the market and all good brands out there are picking up on it. I would look into HiTec,Merrell, Vasque, Keen, North Face and so on...
When it comes to blisters it doesn't matter what anyone tells you there's no fail proof method. It can be attributed to your shoes, feet shape, socks, lacing pattern, humidity conditions and so on. The only certain method is to address it before it happens, as soon as you feel a hotspot, stop and treat it. I do about 15-18miles weekly, mostly on my Merrell's Trail Glove barefoot shoes and sometimes I get blisters and sometimes I dont, the difference is that at home you have time to heal them. Good luck!