Use the following actions to start the corresponding celebration.

Celebration	How to unlock
Backflip	Hold LB and tap Right Analog-stick Up(2).
Bird Walk	Hold LT then tap Right Analog-stick Left(2).
Bottom Dance	Hold LB and press X(2).
Brick Fall	Hold LT then hold Right Analog-stick Left.
Cartwheel	Hold LT and rotate the Right Analog-stick clockwise.
Chest Slide	Hold LB and tap Right Analog-stick Down, Right Analog-stick Up.
Double Backflip	Hold LB, and rotate the Right Analog-stick counterclockwise.
Front Flip	Hold LT then tap Right Analog-stick Up(2).
Hand Spring	Hold LB and rotate the Right Analog-stick clockwise.
Hands on Ears	Hold LT and press X(2).
Head Shake	Hold LB and tap Right Analog-stick Left, Right Analog-stick Right.
Heel Taps	Hold LT and press Y(2).
I Can't Hear You	Hold LT then hold Right Analog-stick Right.
If I Catch You	Hold RT and click Right Analog-stick.
Kiss the Pitch	Hold RT and press B(2).
Knee Slide	Hold LT then tap Right Analog-stick Up, Right Analog-stick Down.
Knee Slide Arms Out	Hold LT then tilt and hold the Right Analog-stick Up.
Knee Slide to Sit	Hold LT then tap Right Analog-stick Down(2).
Le Cirque LaBelle	Hold LT then tap Right Analog-stick Down, Right Analog-stick Up.
Moonwalk	Hold RB then tap Right Analog-stick Left(2).
Movember	Hold LT and press B(2).
Peacock	Hold RB and press B(2).
Pit Bull	Hold RB and press B.
Point to the Sky	Hold LB and press B.
Punch & Dodge	Hold LB then tilt and hold the Right Analog-stick Left.
Robot	Hold LT and click the Right Analog-stick.
Samba Dance	Hold LT then tap Right Analog-stick Left, Right Analog-stick Right.
Shoe Shine	Hold LT and press B.
Show Respect	Hold LB and press B(2).
Side Slide	Hold LT then hold Right Analog-stick Down.
Signature Finishing Move	Press A.
Spanish Archer	Hold LT and press Y.
Standing Archer	Hold LB then tilt and hold Right Analog-stick Right.
Surfer	Hold RB then hold Right Analog-stick Left.
Telling Off	Hold RT and press B.
The Salute	Hold RB and press Y.
Twist Flip	Hold LT then rotate Right Analog-stick counterclockwise.
Violinist	Hold LT and press X.
Water Hose	Hold RT then tap Right Analog-stick Down(2)
Who Am I	Hold LT then tap Right Analog-stick Right, Right Analog-stick Left.
Why Always Me	Hold RB then press Y(2).