Embark on a captivating side quest in the vibrant world of Monster Hunter Wilds to unlock the coveted Monster (Squid) Hunter trophy or achievement. This guide will walk you through the process, turning this intriguing challenge into a rewarding experience.
While fishing might seem like a leisurely detour from the main storyline, it opens up a unique questline and provides the necessary tools for this particular achievement. Your journey begins with Kanya's fishing quests. Complete these side quests by gathering the items she requests:

Seeking the Goldenfish: Locate the Goldenfish in cave pools. Area 6 of the Scarlet Forest is a good starting point. Use either the Golden Bughead or Common Wood Minnow baits. Fallow weather conditions increase your chances of success.
Fishing for Favor: Next, catch the Gravid Bowfin in the Scarlet Forest base camp during "Plenty" weather. The Emerald Jitterbait is the recommended lure.
The Catch of a Lifetime!: Kanya will then ask for a large fish, triggering a reeling minigame. The Tuna in Area 17 of the Scarlet Forest is a reliable option.

After completing these tasks, Kanya will request you to undertake the Razzle Dazzle quest, the final step to obtaining the Monster (Squid) Hunter trophy or achievement.
Razzle Dazzle Quest: Head to Area 17 of the Scarlet Forest. Ensure "Downpour" weather in "Inclemency" conditions (use the grill or camp to adjust weather). Enter the deep end of the lake until you can't proceed further. Look for squids; if none appear, fast travel and return. Equip the Tentacle Jig and begin fishing. Target the Goliath Squid (indicated by glowing blue shells). Once hooked, reel it in to claim your prize and unlock the trophy or achievement.
Monster Hunter Wilds is available now on PlayStation, Xbox, and PC.