The Death on the Reik Add-on for Warhammer: End Times - Vermintide has 8 achievements worth 250 gamerscore.
Survive the boat event without taking damage on Nightmare
Finish Reikwald Forest in X min or less on Nightmare
Burn 100 enemies using a Ceremonial Dagger
Acquire a Ceremonial Dagger
Complete River Reik
Find the second secret on River Reik
Find the first secret on River Reik
Complete Reikwald Forest