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