Yeah the guides nearly finished, the end game section and then a complete run through to make sure everything is correct and it will be done. Hopefully the treasure chests will be all thats required for the achievement, or it may be a repeat of Lost Odyssey's Treasure Trove achievement.
I'd love to play Tales of Vesperia enjoyed the demo, unfortunately its not out in the UK until 2009. Nice to know theres a guide waiting though .
I'm still not 100% certain on the requirements for that achievement so the chests may not be all thats required. The majority of the chests can be opened at any time, but the ones in the castles, the prison, and the tower can only be opened when you first visit the locations.
It may be possibleto return to them in the end game but I have not been able to find out just yet.