The “Need a Bigger Boat” achievement requires players to be killed by a shark in Sons of the Forest. Players can find sharks in the waters along the island’s shore.
The best spot to get this achievement is around the lifeboat where the pistol is located. Swimming towards the orange lifeboat will cause a couple of sharks to spawn. Staying too long in the water will cause the sharks to attack the player.
Before getting killed by a shark, players should save their game since dying from a shark is an instant kill unlike cannibal or mutant-induced deaths. Simply build a makeshift tent on the shore and reload the game once the achievement unlocks.