171. 遇火斩火 Fight Fire With Fire
成就说明：在海乱鬼·炎威的武器附有烈焰的情况下，击败海乱鬼·炎威。
Defeat a Kairagi: Fiery Might while their weapon is infused with Pyro.
Kairagi かいらぎ 海乱鬼
172. 遇雷切雷 Ride the Lightning
成就说明：在海乱鬼·雷腾的武器附有电流的情况下，击败海乱鬼·雷腾。
Defeat a Kairagi: Dancing Thunder while their weapon is infused with Electro.
173. 雷自东来 I Hear Thunder...
成就说明：被雷斧丘丘暴徒引来的落雷击中…
Be struck by the lightning called down by a CracklingAxe Mitachurl...
Cracklingv.（使）发狂
174. A Kill without Water
成就说明：不击败任何「水滴」的情况下（无相之水恢复时除外），击败无相之水。
Defeat the Hydro Hypostasis without destroying a single one of its Water Droplets (except when it is restoring HP.)
175. 海洋生物学者，欧拉！Bio-Oceanic Weapon
成就说明：被无相之水幻化的某种生物击中…
Be hit by a certain animal created by the Hydro Hypostasis...
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