Here is the full list of all 121 The Madness of Little Emma achievements.
Unlock Chloe
Complete Arena as Emma
Complete Arena
Unlock Lucretia
Get very unlucky
Unlock Elizabeth
Find a red chest
Have only 1 heart container
Get really insane!
Find Love Burrow
Unlock Amelia
Unlock final ending
Kill all bosses in episode 4
Kill Spirit
Unlock third ending
Buy 5 items in one playthrough
Kill Eidolon
Kill April
Kill a shopkeeper
Complete episode 1 without collecting hearts and healing herbs
Reach The Riddle
Unlock second ending
Kill 4 Seasons
Kill Summer
Kill Autumn
Kill Spring
Unlock first ending
Kill all bosses in episode 2
Kill all bosses in episode 3
Get very lucky
Destroy a turnip
Kill Alice
Kill Sinister Mask
Kill Manless Face
Kill Winter
Kill the fat man
Reach Den
Reach Misery
Find a secret
Kill all bosses in episode 1
Collect 5 health bonuses in one game
Reach Undergrounds
Kill Haunt
Kill Entozoon
Kill Red Viper
Kill Meat Bag
Kill Green Viper
Die
Kill Mask
Kill a boss
Kill Liquid Sisters
Find everything
Complete ending 4 with clean mind all the time
Unlock every other achievement
Complete episode 2 without collecting hearts and healing herbs
Complete episode 3 without collecting hearts and healing herbs
Complete episode 4 without collecting hearts and healing herbs
Find all Love Items
Unlock fifth ending
Unlock sixth ending
Kill Manless Face as Amelia
Unlock Marah
Complete Arena as Lucretia
Complete Arena as Elizabeth
Complete Arena as Amelia
Complete Arena as Marah
Complete Arena as Chloe