Super Lucky's Tale

The end of the ‘Three Cannon Salute’ level will be a quick final showdown with General Buttons and Mr. Fluffinstuff while they're on their ship. Your task here is to not get hit by their cannonballs all while having them destroy the 3 explosive barrels on their ship.

Once they've crashed it and the cutscene ends, quickly jump into the foxhole to your right and you'll end up at the back of the level with the ship. Now run forwards to the end of the pier and let them shoot at you. Just standing near the end, you shouldn't get hit but two of the barrels should. Once the first two are down, jump onto the ship and stand near the ladder. You should now be at the right angle for the last barrel to be hit and the ship should sink.

If you didn't get hit, the achievement will unlock after the cutscene with Lady Meowmalade.