Army of Ruin
221 Achievements
GOG
Rabbit's Foot
Open 5 Chests
42.2%
How to unlock the Rabbit's Foot achievement in Army of Ruin - Definitive Guide
Necrophage33
I'm not sure if this is cumulative or if it must be done in a single stage, but minibosses show up every other wave, so you'll likely do this within your first couple stages.
