Here is the full list of all 43 SpongeBob's Truth or Square achievements worth 1,000 gamerscore.
You completed a level without dying, without invincibility.
You upgraded all of SpongeBob's furniture.
You unlocked all concept art.
You found Patrick sleeping in all levels.
You found all of SpongeBob's Happiness Objects.
You found the Picnic Basket.
You found the Volcano Hot Sauce.
You survived all 7 Task Tiki Combat Challenges.
You watched all of the credits.
You completed the game.
You found the Karate Gloves.
You found Mr. Krabs' 1st Dollar.
You found Patrick's Alarm Clock.
You unlocked all of the available costumes.
You found the Open 24 Hours sign.
You collected 10,000 Happiness Nuggets.
You found Mermaidman & Barnacleboy's Ring Box.
You found Mermaidman's Utility Belt.
You found the Krabby Patty.
You found the Aquaphone.
You collected 99 Lives.
A Co-op buddy, as Plankton, defeated 100 enemies.
You found the Bellybutton Lint Earmuffs.
You found Squidward's Paints.
You found the Toy Clarinet.
You broke 1000 Plankton Tikis.
A Co-op buddy, as Plankton, shook 50 enemies.
You found Snellie's Pet Carrier.
You found the #1 Soda Drinkin' Hat.
You found the Golden Spatula.
A Co-op buddy, as Plankton, made 100 Happiness Nuggets sad.
You made SpongeBob grow old.
You found the Heart-Shaped Acorn.
You defeated 30 enemies in a row while buff.
You found the Magic Conch Shell.
You fed Patrick a kelp hot dog.
You found the Hot Dog.
You found Sandy's Iced Tea Glass.
You defeated 250 enemies with SpongeBob.
You broke 150 Squidward Stone Tikis.
You found the Bubble Wand.
You found the Baby Jellyfish.
You found SpongeBob's Jellyfishing Net.