The Quest for the Lost Eternia Shards Part 1 Add-on for Dungeon Defenders has 6 achievements.
You defended the portal against the rampaging Spider horde!
You defended the portal against the rampaging Spider horde... on Nightmare!
You retrieved the Purple Lost Eternia Shard from the depths of Mistymire Forest!
You retrieved the Purple Lost Eternia Shard from the depths of Mistymire Forest... on Nightmare!
You completed every mission in the original Campaign on Nightmare difficulty! Are you a god?
You completed every mission in the original campaign on Nightmare difficulty without dying. You are a god.