The Summoner Hero DLC Add-on for Dungeon Defenders has 2 achievements.
Completed the Campaign and 3 Eternia Shards Missions using only summoned minions and Overlord mode for your entire team, except for the Final Wave.
Completed the Campaign and 3 Eternia Shards Missions only using summoned minions and Overlord mode for your entire team, except for the Final Wave... on Nightmare!