Volcano Island

Rocks: complete Terrorizing Bird and return the Albatross head.

• Defeat Tuna and use its body to trigger Albatross.
• Return the Albatross head to the scared Rocks islander.
• Follow the pink Radar marker to the final island.

• Speak to the military officer and the Scientist; their quest records are separate and both should be checked before the ending route.
• Complete the Scientist's requested-catch hand-ins to receive the Fish Bucket used for Bowhead Whale.
• Keep the defeated Bowhead Whale and carry it into the Volcano trigger.
• Defeat Mutated Bowhead Whale, then take the final transport to trigger the finish-game check.
• For Handyman, the achievement code checks the finishing hit on the final boss: use a bare-fist-strength attack dealing under 5 damage for the last blow.

Scientific Lure costs $500 and reaches the five regular deep-sea species. The optional Scientific Boss Lure costs $5,800 and summons Goblin Shark, a commonly missed Collector target.

Check the island stock before leaving; later islands keep much of the earlier equipment while adding the next lure, firearm and attachment tier.

• Equipment and items: Brass Knuckles, Radio, Dynamite, Assault Rifle, Badball, Pistol, Crab-Fishing Rod, SMG, Beer, Sniper Rifle, Radar, Knife, Shotgun, Fishing Rod.
• Bait stock: Scientific Lure, Scientific Boss Lure, Standard Lure, Professional Boss Lure, Professional Lure, Hot Dog, Beginner Lure, Beginner Boss Lure, Standard Boss Lure.
• Attachments: Iron Sight, Laser Sight, Extended Mag, Sniper Scope, Suppressor, Red Dot Sight, Compensator.
• Firearm damage station cap: 12.
• Melee sharpness station cap: 15.

Talk to quest NPCs again after completing their objective; several island coordinates are awarded on the return dialogue rather than on the boss kill itself.

• Military quest giver — starts the large-creature route.
• Military store NPC — sells final-island equipment.
• Scientist — requests five smaller catches, gives the whale trigger and advances the Bowhead-to-mutated-whale chain.