Special thanks to mini ak47, WileyOldFox, Daft Badger for their contributions to the guide. And a very special thanks to Bond OO7, for the discussions with the devs and conversations we had in trying to unlock 5 A Day!
Please note that this is where I got the Signature Smashes but I am certain that you can get them on other locations as well.
There are a total of 20 signature smashes to complete. The list is in the same order as shown in Clubhouse -> Rewards -> Signature Smashes.
1. Baker's Dozen! Found in United States, Kitchen, Unbake My Tart. There is a wooden crate full of eggs slightly to the right of the starting point, Smash that.
2. Caution Wet Floor! Found in United States, Kitchen, Death by Chocolate. Once you use your Smashbreaker, bounce the ball into any mop bucket.
3. Tin Cup! Found in France, Dining Room, Caught Red Handed. Once you use your Smashbreaker, bounce the ball into any can of paint (there are 2 on the table).
4. Bowled Over! Found in United States, Kitchen, All Mixed Up. Once you use your Smashbreaker, bounce the ball into any silver mixing bowl.
5. Bottoms Up! Found in France, Hall of Mirrors, Magnum Force. From the starting point, rotate the camera to the right until you line up your shot with the stack of champagne bottles. Hit those and a cork should pop and hit one of the goblets that are stacked on the table.
6. Microwave Madness! Found in United States, Kitchen, You're Oven a Laugh. You must hit 2 microwaves with one shot. Aim your shot through some bottles above the oven to hit the microwaves (shot adjustment might be required to hit both).
7. You've Got Mail! Found in Australia, Forecourt, No Smoking or Smash and Grab. Get into the 2 mailboxes near the gas pumps.
8. Cheers! Found in France, Hall of Mirrors, Magnum Force. Destroy 450 goblets in the level (there are 480 I believe).
9. Ruined! Found in France, Dining Room, Caution Wet Paint. Directly ahead from the starting point there is a hanging painting with paint cans underneath. Knock the paint cans into the painting.
10. Greek Wedding! Found in France, Dining Room, A Touch of Glass. Destroy 150 plates by knocking the chandelier off the ceiling and onto the stacked plates on the table.
11. More Than 5 A Day! Found in United States, Kitchen, Death by Chocolate. Destroy 500 Oranges. O.k, this one can only be done in Co-op. IMPORTANT!!! PLAYER 1 MUST BE YOUR BACKUP ACCOUNT AND PLAYER 2 MUST BE YOUR MAIN ACCOUNT!!! It will not work any other way! With player 1, destroy every single crate of oranges (you cannot miss even 1 of the oranges!) and you must also complete the putt to end the level. (The setup for the second player will glitch for player 2 if both criteria are not filled. No Smashbreaker). This should leave you with less than 150 oranges to destroy. Mop up with player 2 to unlock the Signature Smash for your main account.
****Another place to get this is Australia, Forecourt, Vegetable Oil. I was playing win co-op. Backup account on player 1 and main account on player 2. I cleared all of the vegetable crates with player 1 and again with player 2. When using player 2, I would putt into a hole other than the finishing hole (ex bronze, silver, gold, platinum holes) and the I would be able to RETEE ans smash the crates again.***
12. Grapes of Wrath! Found in France, Wine Cellar, Grapes of Wrath. From the start point, aim towards the alcove to the right of the champagne bottles on the floor. Smash 50 bottles in the level for this
13. Up The Spout! Found in Australia, Rooftop, Sign of the Times. There is a spout near the flag. Aim your ball there to go up.
14. Happy New Year! Found in England, Queen's Corridor, Bubble Trouble. Destroy 50 champagne bottles.
15. Burnt toast! Found in United States, Kitchen, Toasted. Awarded for popping 3 toasters.
16. Candid Camera! Found in Australia, Forecourt, Smash and Grab. Shoot your tee shot through the window on the door and use your Smashbreaker to destroy the surveillance TV in the corner behind the cash register.
17. Car Jacked! - Found in Australia, Store, Kick the Bucket. Awarded For Riding A Carjack and Hitting Some Tires.
18. Trolley Warriors! Found in England, Great Hall, Glass Kicker. Flinging a trolley into a knight
19. Sploosh! Found in United States, Bathroom, Flushed Away. Once you use your Smashbreaker, bounce the ball into any toilet bowl.
20. Number 1 Super Guy! Found in Australia, Workshop, An Auto Body Experience. Get this by hitting the filing cabinets.