There are 43 achievements worth a total of 1000 points
Find SpongeBob's Jellyfishing Net.
Find Sandy's Iced Tea Glass.
Find the Hot Dog.
Find the Golden Spatula.
Find the Toy Clarinet.
Find the Bubble Wand.
Find the Krabby Patty.
Find the Karate Gloves.
Find Squidward's Paints.
Find Mermaidman's Utility Belt.
Find the Baby Jellyfish.
Find Patrick's Alarm Clock.
Find the Open 24 Hours sign.
Find the Heart-Shaped Acorn.
Find Snellie's Pet Carrier.
Find the #1 Soda Drinkin' Hat.
Find Mr. Krabs' 1st Dollar.
Find the Magic Conch Shell.
Find the Aquaphone.
Find Mermaidman & Barnacleboy's Ring Box.
Find the Volcano Hot Sauce.
Find the Picnic Basket.
Find the Bellybutton Lint Earmuffs.
Find all of SpongeBob's Happiness Objects.
Find Patrick sleeping in all levels.
Break 150 Squidward Stone Tikis.
Break 1000 Plankton Tikis.
Defeat 30 enemies in a row while buff.
Defeat 250 enemies with SpongeBob.
Have a Co-op buddy, as Plankton, defeat 100 enemies.
Have a Co-op buddy, as Plankton, shake 50 enemies.
Have a Co-op buddy, as Plankton, make 100 Happiness Nuggets sad.
Collect 99 Lives.
Collect 10,000 Happiness Nuggets.
Unlock all of the available costumes.
Upgrade all of SpongeBob's furniture.
Unlock all concept art.
Feed Patrick a kelp hot dog.
Survive all 7 Task Tiki Combat Challenges against the robot cretins.
Complete any level without dying, without invincibility.
Complete the game.
You made SpongeBob grow old.
You watched all of the credits.