The Nightmare Title update for Warhammer: End Times - Vermintide has 13 achievements worth 390 gamerscore.
Protect all four wards in the Wizards Tower on Nightmare
Drop all tomes and grimoires within Garden of Morr into the Cauldron on Nightmare
Destroy all 4 chains holding up the Screaming Bell within 5 seconds on Man the Ramparts on Nightmare
Complete Supply and Demand without any member of the team using Healing Items on Nightmare
Alert the city by blowing the Horn of Magnus within 4 minutes of the gate exploding on Nightmare
Escape the second warehouse within 60 seconds of escaping the first on Waterfront on Nightmare
Deliver all sacks to the wagon without dropping them once on Wheat and Chaff on Nightmare
Bring at least 3 explosive barrels to the wagon on Smuggler's Run on Nightmare
Destroy all 3 Doomwheels within 5 seconds on Engines of War on Nightmare
Complete Well Watch without either of the wells being poisoned on Nightmare
Kill 13 Gutter Runners on The Enemy Below on Nightmare
Kill 5 Stormvermin with Skaven technology on White Rat and then complete the mission on Nightmare
Complete Black Powder without killing the Rat Ogre on Nightmare