Here is the full list of all 32 SpongeBob SquarePants: Battle for Bikini Bottom - there are Rehydrated achievements.
Find all (80) of Patrick's Socks
Get 100% completion. All golden spatulas and all socks
Get all 100 Golden Spatulas
Defeat the Flying Dutchman
Reclaim the Flying Dutchman's ship in the Flying Dutchman's Graveyard
Defeat Robo-Plankton and neutralize SpongeBot SteelPants' Brain.
Defeat SpongeBot SteelPants in the Chum Bucket Lab
Get 75 Golden Spatulas
Find all the Lost Campers in Kelp Forest
Find all the hidden Golden Spatulas in Bikini Bottom.
Talk to Squidward 10 times as SpongeBob.
Find half (40) of Patrick's Socks
Finish the main missions of Goo Lagoon
Defeat 100 robots as Patrick in the campaign.
Collect everything in SpongeBob's House.
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
Get 50 Golden Spatulas
Defeat Robo-Patrick in the Industrial Park
Defeat Prawn in the Mermalair
Complete Squidward's Mission in Jellyfish Fields
Clear all the Ski slopes in Sand Mountain
Finish the main missions of Rock Bottom
Find 15 of Patrick's Socks
Defeat 100 robots as Sandy in the campaign.
Get 25 Golden Spatulas
Complete the Rolling Ball Puzzle in Mermalair
Defeat 100 robots as SpongeBob in the campaign.
Defeat Robo-Sandy in the Poseidome
Complete Mrs Puff's Mission in Downtown Bikini Bottom
Collect 10 Golden Spatulas
Defeat Jellyfish King.