Full list of all 21 So Many Me achievements worth 1,000 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox One.
Craft 10 artifacts
Finish the game
Have 3 different Transmuter Fruits on 3 ME at the same time
Acquire every ME
Unlock both gates at Volcano's entrance
Defeat a Duffon
Dream.Build.Play
In the Chono Castle, Stomp on enemies' head 10 times, without falling or creating a stone block
Defeat the rival
Walk around the moon
Fail your friends
Meet Woodword
Rescue a girl
Use the Gene Splicer to create Jellosaur
Acquire the first ME
Acquire 42 costumes
Collect every coin in Chrono Castle
Reach 100% completion
Turn on every light in Chrono Castle
Finish Chrono Castle XI with both coin bubbles collected
Finish Chrono Castle XII without turning on Etherizer