requires you to reach Wave 15 on Survival
or Pure Strategy
on Medium or higher difficulty. Earning this achievement unlocks the Goblet Crystal Skin
- Iron Man - Reached Survival Wave 10 on Insane Difficulty
- Survivalist - Reached Survival Wave 15 on >= Medium Difficulty
- Tough Guy - Reached Survival Wave 15 on >= Hard Difficulty
- Thick Skin - Reached Survival Wave 20 on >= Medium Difficulty
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