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