On the PTS today (3/26/2012) are four more achievements for a separate encounter.
- Battle Prod
Defeat Maklamos the Scryer while solving the Crystal Lasers within 15 seconds of them activating.
- Desolation Denied
Defeat the Emberlord Conclave killing Emberlord Ereetu last.
Defeat Maklamos the Scryer with no deaths to Crystalline Desolation.
Defeat the Ember Conclave with once with Emberlord Ereetu, Witchlord Szath & Packmaster Nahoth alive last.*
* More than likely an error of wording; I will update both the screenshot and text description when it is fixed on the PTS.