Rise of Nightmares
50 Achievements
1,000
Xbox 360
Ernst
Defeated at least 100 creatures with Ernst's chains.
10
How to unlock the Ernst achievement in Rise of Nightmares - Definitive Guide
*POSSIBLE SPOILERS*
Despite what the other solution says, you need 100 kills with Ernst's Chains for this, not 50. The easiest way to get this is to simply play through act 6 a couple of times, since you have the chains for the entire duration of that act. You'll have to play it three times anyway while going for the three difficulty related achievements, so this one should come naturally. If it doesn't, the chains can also be found on act 10-1 on the ground next to the altar directly in front of you when you exit the basement, and at the start of the third area (the chef area) of act 10-3.
Despite what the other solution says, you need 100 kills with Ernst's Chains for this, not 50. The easiest way to get this is to simply play through act 6 a couple of times, since you have the chains for the entire duration of that act. You'll have to play it three times anyway while going for the three difficulty related achievements, so this one should come naturally. If it doesn't, the chains can also be found on act 10-1 on the ground next to the altar directly in front of you when you exit the basement, and at the start of the third area (the chef area) of act 10-3.
In Act 6, you play as Ernst, the large monster that launches chains from his hands. Kill 100 enemies with these chains to unlock the achievement. You can replay Act 6 to get the required kills if desired.
in Act 10-1 and 10-3, you can find the weapon, Ernst's Chain, which also counts towards this achievement.