Lovely Craft Piston Trap Achievement Guide Work ~repack~ -

Run redstone from the pressure plate into a block. Place a redstone torch on the opposite side of that block. Run redstone from that torch to the pistons.

If you want the trap to hold the mob indefinitely until you release it, use an RSNOR latch or simply keep the lever in the ON position. The achievement will trigger as soon as the 3-second condition is met. lovely craft piston trap achievement guide work