Asdivine Hearts II

This achievement is for collecting 280 treasure chests in the game, and doesn't appear to be missable (Hooray!!!). It's also easier than it seems.

Along the way, you will also net these achievements:

The RPG Insanity forums (thanks Most Useless Person Ever!) has a good partial list of treasures from the first 2 worlds, but is missing treasures from the last world (Riveria):
https://www.rpginsanity.com/forum/asdivine-hearts-2/19616-tr...
However, Riveria only has about 7 locations, so it's not too difficult to clean the remainder up yourself using the Treasure Searcher items (see below).

I used the partial list to mark off the treasures in each area as I went through.
- Some treasures can't be collected without special jewels (Spike Jewel to move freely across ice, Heavy Jewel to walk freely over arrow tiles), so you'll need to backtrack a little to pick these up once you've purchased them with Guild Coins from the arena exchange shop.
- Other treasures require the trust abilities of your party (Felix to fit in holes, Stella to cross gaps, Uriel to read stones, Nadia to break rocks). Once you've raised each party member's trust (required for achievement), then you can backtrack and get these treasures.
- You will also need certain Quartz items to unlock doors in Arnolt Temple and the Forgotten Village, which nets you number of chests.

These extra items/trust abilities may not all be needed however...

There are actually MORE THAN 280 chests (Records screen shows 308). Which means that you don't actually need to get every single treasure chest, just 280 of them. That was a huge relief for me when I popped the achievement at 280, as I was worried that I'd miss something.

Lastly - you can buy items called Treasure Searchers from the shop, which tell you how many treasures remain in your current area. This is an awesome feature - so if you can't be bothered tracking items, you can just buy a heap of these at the end-game and go to each area to clean up.