"Ew Ew Ew Ew" is a challenge from Tiny Tina's Assault on Dragon Keep DLC
Completion
To complete this challenge you need to kill Spiders anywhere in the Tiny Tina's Assault on Dragon Keep DLC. They are most commonly found in [[Borderlands 2: The Forest
Ranks and Rewards
Lv 1 - Kill 25 Spiders
Badass Ranks: 1
Lv 2 - Kill 50 Spiders
Badass Ranks: 5
Lv 3 - Kill 100 Spiders
Badass Ranks: 10
Lv 4 - Kill 150
Badass Ranks: 50
Lv 5 - Kill 200 Spiders
Badass Ranks: 100