I don't know if anyone mentioned it:
When trying to play "The Faeries' Chest" you only get 4 chances to miss to get the achievement. If you miss it refresh the page. It will reset the "miss" counter and you'll get a chance to get the achievement (that doesn't really come with anything crazy, but stuff is stuff, right?)..
You get ectoplasm by fighting the wraith. It's extremely easy to beat if you equip the brand new salty weapon everyone got.