Last tested: Minecraft Bedrock 1.21.30. Achievement unlocked successfully.
Build carefully, account for the lag on your server (if on Realms, add 1 extra tick to each repeater), and you will add this elusive achievement to your collection. lovely craft piston trap achievement guide patched
The piston pushes the boat, but the zombie floats out. Solution: The 1.21.30 patch changed boat collision. You need to place a block of honey on the wall facing the piston. Honey blocks prevent mobs from dismounting boats during redstone events. Last tested: Minecraft Bedrock 1