There is a pack-a-punch but its only accessible when you build the plane and fly to San Francisco bridge.
Making the rounds achievement involves building the plane, flying to the bridge and using the electric chairs 3 times in one game.
Feed the beast achievement involves feeding the 3 dog heads around the map until they disappear into the wall again, once all 3 are fed a secret door opens in the catacombs so you can collect hells retriever
Gg bridge achievement involves building the plane and flying to the bridge, once at the bridge survive an entire round(beginning to end).
That's all for now will update as I do more