Here is the full list of all 28 The Smurfs - there are Mission Vileaf achievements.
Make Papa Smurf cough
Complete the 100% of the game
Build all of the upgrades
Find all of the mandrakes
Get across the Laboratory without getting caught by Gargamel
Find all of the mushrooms
Find every vial
Find every piece of bark
SmurfoGlide for 10 seconds
Find all of Jokey’s presents
Jump on 3 Vilecritters' heads in a row
Complete the adventure in Easy mode
Complete the adventure in Normal mode
Complete the adventure in Hard mode
Complete the Chapter: Gargamel
Make 10 flowers of every color grow by using the Smufizer
SmurfoSprint for 100 meters
Heal the entire village
Perform a SmurfoSprint, Jump and SmurfoSplat combo!
Find and wake up Lazy 3 times
Complete the Chapter: The Swamp
Complete the Chapter: The Castle
Build your first upgrade
Complete the Chapter: The Forest
Destroy 100 crates of Sarsaparilla
Complete the Chapter: The Village
Perform 10 perfect jumps in a row
Find the flower for the Smurfizer