The achievements for Viva Piñata: Trouble in Paradise have just made their way onto the interwebs and among the traditional gardening achievements we spotted an extremely interesting and feature revealing "Full House" achievement. This 10 Gamerscore earning "Full House" achievement pretty much confirms co-op details we never knew about Trouble in Paradise, reading "Play 4 Player Online Co-op for 1 hour". That's right, the once thought to be only two player local co-op Trouble in Paradise will now sport four player online co-op! That is, if the achievements can be trusted. We already have our Vision camera warmed up and ready to go, bring on the four player online piñata fun!

source (http://www.360sync.com/2008/08/09/viva-pinata-trouble-in-paradise-achievements)