Here is the full list of all 30 So Many Me achievements.
Meet Woodword
Rescue a girl
Finish any level while riding a Jellosaur
Have 8 ME in 8 different appearances at the same time
Use the Gene Splicer to create Jellosaur
Acquire the first ME
Fail your friends
Defeat the rival
Defeat a Duffon
Unlock both gates at Volcano's entrance
Finish the game
Acquire every ME
Acquire 42 costumes
Craft 10 artifacts
Collect every coin in Chrono Castle
Reach 100% completion
Enter Chrono Castle
Walk around the moon
Have 3 different Transmuter Fruits on 3 ME at the same time
Have a ninja hanging upside down on a blue fist
Turn on every light in Chrono Castle
In the Chono Castle, Stomp on enemies' head 10 times, without falling down to the ground or creating stone block
Kill 10 Cloud-9 soldiers while both 9th Rifle and Helmet are turned on
Confront all possible questions in Chrono Castle X and choose all correct answers
Finish Chrono Castle XII without turning on Etherizer
Finish Chrono Castle XI with both coin bubbles collected
Score 550 or more in Chrono Castle XIII
Score 80 or more in Chrono Castle XIV
Score 50 or more in Chrono Castle XV
Dream.Build.Play