Here is the full list of all 32 SpongeBob SquarePants: Battle for Bikini Bottom - there are Rehydrated achievements.
Talk to Squidward 10 times as SpongeBob.
Get 100% completion. All golden spatulas and all socks
Get all 100 Golden Spatulas
Defeat Robo-Plankton and neutralize SpongeBot SteelPants' Brain.
Defeat SpongeBot SteelPants in the Chum Bucket Lab
Find all (80) of Patrick's Socks
Defeat the Flying Dutchman
Reclaim the Flying Dutchman's ship in the Flying Dutchman's Graveyard
Get 75 Golden Spatulas
Find all the Lost Campers in Kelp Forest
Defeat 100 robots as Patrick in the campaign.
Get All Golden Spatulas in the SpongeBob's Dream level
Destroy at least one type of every robot in the game. Bosses don't count
Defeat 100 robots as Sandy in the campaign.
Find all the hidden Golden Spatulas in Bikini Bottom.
Defeat Robo-Patrick in the Industrial Park
Clear all the Ski slopes in Sand Mountain
Get 50 Golden Spatulas
Finish the main missions of Rock Bottom
Find half (40) of Patrick's Socks
Defeat Prawn in the Mermalair
Complete the Rolling Ball Puzzle in Mermalair
Defeat Robo-Sandy in the Poseidome
Finish the main missions of Goo Lagoon
Get 25 Golden Spatulas
Complete Mrs Puff's Mission in Downtown Bikini Bottom
Defeat 100 robots as SpongeBob in the campaign.
Find 15 of Patrick's Socks
Complete Squidward's Mission in Jellyfish Fields
Collect 10 Golden Spatulas
Defeat Jellyfish King.
Collect everything in SpongeBob's House.