Here is the full list of all 26 Unruly Heroes achievements.
Finish all levels at emerald rank
Obtain all skins
Play the whole adventure
Complete world Flaming Mountain
Obtain all scrolls
Trigger 4 power up at the same time
Kill one of you coop friend
Complete Underworld
Complete world Taoist Temple
Obtain 1000 coins
Finish any world at emerald rank
Complete one level under 5 minutes
Kill the Skull Canyon boss
Complete world Skull Canyon
Enter inside a controllable creature
Grab two enemies in less than 10 seconds
Play a Multiplayer match
Perform 100 walljumps in total
Obtain 100 coins
Finish any level at emerald rank
Finish a level without losing any character
Perform a 20 hits combo
Complete first Skull Canyon level
Reach 200 meters in gliding distance
Unlock all checkpoints of a map
Activate any character's power