Cassette Beasts
100 Achievements
1,000
40-50h
PC
Xbox One
Xbox Series
Monster Mash
Defeat a Swarm
5
10.59%
How to unlock the Monster Mash achievement in Cassette Beasts - Definitive Guide
LEMMY66
TrueAchievements
TrueAchievements
The Fusion Swarms will begin to Spawn in lv 20+ areas. They look similar to the normal Rogue Fusions, but they have like a cloud above their head. Simply walk into one, and kill it as the achievement is yours!
