Here is the full list of all 20 The Swords of Ditto achievements.
Find all of Ditto's History Logs
Break the Curse of Ditto
Defeat Mormo with all of her Anchors active
Find all Toys of Legend
Equip 12 limited edition Stickers
Complete an Offering
Swap a Sticker with someone on Ditto
Destroy all of Mormo's Anchors in a story
Get a limited edition Sticker from Ock
Reverse time by a day
Defeat Mormo for the first time
Meet Serendipity
Complete a Dojo
Destroy one of Mormo's Anchors
Equip a limited edition Sticker
Find a Toy of Legend
Open a crate
Equip a Sticker
Visit the grave of a failed Sword of Ditto
Upgrade your bomb capacity to maximum