can`t get this achievement. how to get it? any help, anyone?

Avast enabled and a error popped up and all of a sudden as soon as I start it, it just closes Edit UPDATE: I tried to reinstall and make avast not pop up and it still is not opening.

Craftimals is one of my favorite games of all time (yes, really) because of its shared creative space and laid back, hands-off design. Does this game have co-op like Craftimals?