SpongeBob SquarePants Underpants Slam!
12 Achievements
200
6-8h
Xbox 360
Xbox One
Xbox Series
Jellyfisher
Defeat 100 Jellyfish!
15
How to unlock the Jellyfisher achievement in SpongeBob SquarePants Underpants Slam! - Definitive Guide
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TrueAchievements
TrueAchievements
Just keep playing custom games with a second controller, and focus on killing the jellyfish and set the time to 10:00 mins