I'll cross-post this in the Rick and Lori achievements.
Save yourself at least a little bit of pain with this awful game by playing as Rick and saving up your upgrade points rather than using them. You don't really need upgrades if you are playing on Easy and once you've got enough points to max out his skill tree, do it. The achievement will unlock but you can then quit back to the dashboard.
Reload the game and you'll have all those upgrade points banked and ready to use on Lori's skill tree. One of her achievements requires certain upgrades, which is why I suggest playing as her second.
Yeah, it's a bit cheaty but I've just saved you a few hours of horrible gameplay. So we're cool, right?